In the United Kingdom, black currants are a go-to flavor for candies, beverages, and some medications, but less than an estimated 1% of Americans have ever sampled the fruit. The small, purple-black berries (which taste like a blueberry-cranberry blend) grow in clusters on the Ribes nigrum bush and were once enjoyed by American colonists and early presidents. In 1899, an estimated 12,000 acres of commercial farmland were dedicated to the crop, which was harvested for wine, baked into pies, and preserved as jam. However, the success of American black currants was short-lived, thanks to an ecological snafu.
Black currants are high in vitamin C, a deficiency of which causes scurvy. During World War II, when import blockades made citrus harder to find, the British government distributed Ribena — a black currant juice beloved by Brits — as a vitamin C supplement.
In the early 1900s, researchers discovered that pine trees near black currant plantings often became sick with a type of fungus known as white pine blister rust. The disease causes lesions on branches and trunks; as the blisters spread, the tree begins to die, and its evergreen needles turn a rusty hue. In an effort to protect the white pine logging industry — one of the most valuable in the nation at the time, and worth up to $1 billion — Congress banned black currants in 1911, going so far as to destroy currant farms with herbicides. Five decades later, botanists lobbied in favor of a return to currant farming, arguing that newly developed bushes were disease-resistant and posed little risk when planted away from pine trees. But despite federal approval for growing the currants in 1966, many states upheld their bans. Connecticut’s 1929 law fined anyone in possession of currant plants up to $25 until 1988, and New York — the top currant producer of old — held out until 2003. Today, black currants are making a slow comeback, with berry farmers in New York, Minnesota, Connecticut, and elsewhere hoping these fast-growing vines will be restored to their former glory.
Black currant Skittles are replaced with grape-flavored candies in the U.S.
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Bristlecone pine trees keep their needles for 30 years.
Pine trees are known among arborists for their longevity, with some species living 300 to 500 years. Bristlecone pines are especially long-lived, with the slow-growing elders of the species reaching nearly 5,000 years old. Bristlecones are in no rush to grow, a feature that helps these hardy conifers survive in challenging climates. Primarily found among the Sierra Nevada and Rocky Mountains, the trees survive despite short growing seasons, often intensely cold temperatures, rocky soils, and winds that form their trunks and branches into gnarly twists. To thrive, the trees conserve much of their energy by retaining their needles; unlike other pine trees that replace their bristly leaves every two to seven years, bristlecones hold on to their needles for about 30 years or more.
Nicole Garner Meeker
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Nicole Garner Meeker is a writer and editor based in St. Louis. Her history, nature, and food stories have also appeared at Mental Floss and Better Report.
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The evolutionary philosophy of elephants might be described as “go big or go home.” Elephants are the largest land animals on Earth, sport the largest ears of any living creature, and are all-around the strongest mammals by a long shot. But their most famous feature (and the inspiration behind the name of their taxonomic order, Proboscidea) is their trunk, which can grow to 6 feet long. The trunk is central to an elephant’s survival, helping it breathe, smell, eat, and drink, and it’s controlled by a network of 40,000 muscles. By comparison, the human body has only around 650 musclestotal.
Although our hands are an impressive patchwork of muscles, the smallest skeletal muscle in the human body is in our inner ear. Called the stapedius, this mini muscle is only 2 millimeters long and supports the body’s smallest bone — the vibration-conducting stapes.
But its large collection of muscles is only the beginning of an elephant trunk’s impressive capabilities. For one thing, the animal’s sense of smell is second to none — it’s been reported that elephants can smell water up to 12 miles away. One reason for this is that elephants have more scent receptors and a bigger olfactory bulb than any other living mammal (see: “go big or go home”), but this capability is helped along by the fact that an elephant trunk is essentially a sniffing antenna that can investigate smells closely and accurately. Elephants are also the only mammals that can remain submerged deep in the water but still breathe, thanks to their snorkeling trunks. Some scientists hypothesize that the modern elephant’s water-wading ancestors possibly developed long trunks for this very purpose. All in all, the elephant trunk is a biological masterpiece some 40 million years in the making.
The strongest animal relative to its size is the horned dung beetle, which can lift 1,141 times its weight.
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The elephant’s closest living relatives look nothing like it.
From their gargantuan size to their matriarchal social structure, elephants are truly unique creatures in the animal kingdom. In fact, their closest living biological relatives look nothing like them — one lives in the sea, and the other weighs only about 10 pounds. Sirenians, known less elegantly as “sea cows” (which includes manatees and dugongs), share a common ancestor group with elephants, one that died out around 50 million years ago and was likely a wading animal that lived near water. The elephant’s other close relative, the rock hyrax (Procavia capensis), looks more like a rodent than any sort of lumbering land giant. However, upon closer inspection, the rock hyrax and elephant do share similar toes, wrists, and skull structures. The rock hyrax also has oversized incisors that act similar to elephant tusks. When it comes to nature, there’s always much more than meets the eye.
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Darren Orf lives in Portland, has a cat, and writes about all things science and climate. You can find his previous work at Popular Mechanics, Inverse, Gizmodo, and Paste, among others.
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Few people in history are credited with saving millions of lives, but one person who did so worked for Volvo. Swedish engineer Nils Bohlin’s improvement on the three-point seat belt has helped drivers (and passengers) safely reach their destination for more than six decades.
Seat belts are a standard feature in today’s cars and trucks, but it hasn’t always been that way. Early on, car manufacturers weren’t required to include safety belts in vehicles. When they were built in, the earliest seat belts were simple two-point restraints that secured across the waist (aka lap belts). While a step in the right direction, lap belts had some downsides — they didn’t protect the upper body during a collision and could even cause injuries during high-speed crashes. A three-point design was created in 1951 by Americans Roger W. Griswold and Hugh DeHaven, but it never took off, likely because it was uncomfortable.
Modern airbags are far more advanced than the earliest “air cushions” designed by two British dentists during WWI. Concerned about jaw injuries, Harold Round and Arthur Parrott patented their airbags in 1920.
Recognizing these issues, Swedish carmaker Volvo hired Bohlin (a former aviation engineer who helped create pilot ejection seats) as the company’s safety engineer, and tasked him with a redesign. Bohlin’s creation — a more comfortable V-shaped belt that stays in position across both the chest and hips — was drafted in under a year, and is the style used in cars today. Volvo quickly added the belts to its cars in 1959, before the inventor even secured a patent. But when he did, Bohlin and Volvo didn’t look to profit off the safety feature. Instead, they released the design publicly, urging all car manufacturers to add the upgraded belts. After years of presentations and crash test dummy demos, Volvo eventually made headway — the evidence of which is found in our cars today and credited with saving lives around the world.
In 1984, New York became the first state to require seat belts.
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The first crash test dummy was named Sierra Sam.
The National Highway Traffic Safety Administration relies on a whole crew of crash test dummies to better understand the mechanics of collisions and to make car travel safer. Each one of those mannequins is a descendant of Sierra Sam, the very first research dummy. Introduced in 1949, Sierra Sam was the work of Samuel W. Alderson, a physicist and inventor who developed motors for missile guidance systems during World War II and motorized prosthetic arms for IBM. Alderson’s first dummies were used by the U.S. military to test pilot helmets and harnesses, parachutes, and plane ejection seats. Sierra Sam even made his way into NASA’s tests for the Apollo space capsule. Alderson then developed a dummy, called the VIP-50, for automobile testing in 1968. In the years since, dummies have been improved and packed with technology and sensors that today require up to five months of construction and $1 million in costs.
Nicole Garner Meeker
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Nicole Garner Meeker is a writer and editor based in St. Louis. Her history, nature, and food stories have also appeared at Mental Floss and Better Report.
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Evolution has devised a mind-boggling number of amazing methods for perpetuating life on Earth. But one of nature’s most impressive tricks is pumping the brakes on pregnancy with a process known as embryonic diapause. This isn’t a rare prenatal feat, either: An estimated 130 mammal species, such as mice and seals, can pause a pregnancy for anywhere from a few days to as many as 11 months, as is the case with the tammar wallaby (Notamacropus eugenii). The pause usually occurs during the blastocyst stage, when an embryo forms in the uterus but doesn’t embed into the uterine wall until conditions are right.
Some sharks can be pregnant for more than three years.
The embryos of frilled sharks (Chlamydoselachus anguineus) grow at a glacial pace, adding only about a half-inch per month. In total, these sharks can be pregnant for up to three and a half years — the longest of any vertebrate.
Scientists have identified two reasons why some mammals pause pregnancies. When animals are nursing, a rise in hormones prevents embryos from implanting, which gives the nursing young time to wean off their mother. The second reason is a bit more complicated, but certain animals can pause pregnancies when external conditions — such as a lack of food or harsh temperatures — are not ideal for raising a newborn. Scientists have known about this kind of diapause since at least the 1850s, but are only now beginning to understand its inner workings. In 2020, a study found that a catalytic enzyme known as mTOR — which regulates cell proliferation, growth, and protein synthesis, and also senses a cell’s nutrient and energy levels — instigated a metabolic response related to diapause when it was inhibited. Scientists are still piecing together exactly why humans, who also have mTOR enzymes, can’t pause pregnancies; understanding how this process works could lead to advancements in stem cell research and cancer treatment.
The tailless tenrec (Tenrec ecaudatus) has 32 babies per brood, the most of any mammal.
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Humans might be born 12 months too early.
Ever wonder why humans are born relatively defenseless compared to other mammals? Some scientists believe a human’s gestation period should be around 21 months — not nine. So what gives? Turns out, a variety of factors might explain why humans are born less developed compared to other mammalian species. The traditional belief is that natural selection favors our big brains and bipedalism at a detriment to longer gestation. These factors, combined with the small pelvises of people who give birth, create a situation where humans are essentially born prematurely. However, some scientists instead suggest that a person’s metabolism, and the energy demands of pregnancy, might be the reason. Simply put, a human can only spend so much energy daily until they max out. A person will almost always give birth right before reaching that “metabolic danger zone.”
Darren Orf
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Darren Orf lives in Portland, has a cat, and writes about all things science and climate. You can find his previous work at Popular Mechanics, Inverse, Gizmodo, and Paste, among others.
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Summer means mosquitoes — and if it feels like they always specifically seek you out, you may not be imagining it. While mosquitoes are drawn to a range of signals — including the carbon dioxide you exhale, body heat, sweat compounds such as lactic acid, skin bacteria, and even visual cues such as movement and darker clothing — some research suggests blood type may also play a role in how attractive a person is to mosquitoes.
Some controlled experiments have found that mosquitoes land on people with type O blood about twice as often as those with type A, with preferences for type B and type AB typically falling somewhere in-between. Researchers have theorized that this pattern may be linked to subtle differences in chemical signals tied to blood type antigens that can appear in skin secretions and influence body odor. But the research into this is limited, and scientific opinion remains divided on the significance of the studies that have been conducted so far.
It’s actually the opposite. Male mosquitoes don’t bite at all; they feed on nectar and plant sugars for energy. Females, however, need a protein-rich blood meal to develop and produce eggs.
Regardless, when it comes to mosquito preferences, blood type is only one piece of the puzzle. The effect appears to be relatively modest compared to stronger attractants such as carbon dioxide output, body odor, and skin microbiome differences, which vary widely from person to person. Mosquito attraction is also highly context dependent, changing with activity level, environment, and time of day. Researchers continue to study how those factors interact, and why some people consistently appeal to mosquitoes more than others.
Because it transmits diseases that kill 1 million people every year, the mosquito is known as the world’s deadliest animal.
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The science in “Jurassic Park” was inspired by a real mosquito fossil.
In Michael Crichton’s 1990 novel Jurassic Park, scientists recover dinosaur DNA from the blood in mosquitoes that had bitten dinosaurs before becoming trapped in tree resin and preserved in amber. Crichton was inspired by real scientific interest in ancient DNA and by the discoveries of insects preserved in amber.
That said, no usable dinosaur DNA has ever been recovered under those circumstances. Most researchers agree that DNA degrades too quickly to survive intact for tens of millions of years and that any dinosaur DNA recovered would be contaminated with the mosquito’s DNA. Even so, amber fossils continue to provide valuable clues about prehistoric ecosystems — including the insects that lived alongside dinosaurs.
Kristina Wright
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Kristina is a coffee-fueled writer living happily ever after with her family in the suburbs of Richmond, Virginia.
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Calories aren’t the only difference between a can of Coca-Cola and a can of Diet Coke. If you were to drop a full, closed can of each into water, you’d observe another distinction: Regular Coke sinks, while Diet Coke floats.
It’s a curious idiosyncrasy given that the two cans seem nearly identical otherwise; they're the same size, contain the same amount of liquid, and use the same aluminum material. This peculiarity comes down to a difference in density, aka how much mass is packed into their given volumes.
Aluminum cans are actually highly recyclable. They can be recycled repeatedly without losing much quality, making them one of our most sustainable materials.
A 12-ounce can of regular Coke contains 39 grams of sugar (roughly 10 teaspoons). Diet Coke, though, gets its sweetness from artificial sweeteners such as aspartame. Because that sugar substitute is about 200 times sweeter than the real thing, very little of it — just 0.2 grams per can — is needed to achieve the same taste.
The diet can, then, contains far less dissolved sweetener and therefore weighs a bit less overall. Objects that are denser than water sink while those that are less dense float, and Coca-Cola’s sugar adds enough extra mass to make the can slightly denser than water.
The name of the porous volcanic rock that can float is pumice.
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Coca-Cola originated as a “wine.”
You may have heard that early Coca-Cola contained cocaine, but in its earliest form, the drink was also an alcoholic beverage. In the 1880s, Georgia pharmacist John Stith Pemberton created a drink called Pemberton’s French Wine Coca, inspired by popular European coca wines such as Vin Mariani that combined coca leaf extract with alcohol.
Pemberton’s tonic contained wine, kola nuts for caffeine, and coca leaves, which naturally contained small amounts of cocaine. It was marketed as a medicinal drink that claimed to boost energy, improve mood, and relieve headaches. But in 1886, shortly after Pemberton debuted his drink, his home base of Atlanta passed prohibition legislation. To continue selling his product, Pemberton removed the alcohol and reformulated the recipe as a soft drink.
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Photographers have relied on the magic of cheese for decades — just mentioning the word is enough to turn up the corners of our mouths into a picture-perfect grin. But the earliest photographers utilized a different food to help purse their subjects’ puckers: prunes. According to Christina Kotchemidova, a communications professor and researcher, British photography studios of the past encouraged people to say “prunes” in an effort to tighten their lips, a look that was more socially preferable than a wide smile.
Before instant photos, Polaroid created goggles for dogs.
Instant photos hit the market in 1948 thanks to inventor Edwin Land. But his company, Polaroid, used polarizer filters in other items before cameras. Some of Land’s earliest products included a 3D movie process, upgraded military periscopes, and even glare-reducing dog goggles.
Most 19th- and early 20th-century photos show subjects with a solemn expression, a look that’s often attributed to the long exposure times of early cameras; holding a neutral expression for several minutes was easier than maintaining a smile. But social norms also played a big role — stern faces remained popular even after photo technology had improved well enough to easily capture smiles by the late 1800s, and some historians say that smiling was once considered improper. Beauty standards of the time called for mouths to have a subdued appearance; Kotchemidova’s research suggests people were expected to have “carefully controlled” mouths with small pouts.
According to one study of nearly 38,000 high school yearbook photos from the 1900s to the 2010s, smiling in photos became more popular by the mid-20th century. Some historians believe the switch was influenced by two factors: dental care and home photography. Without widespread access to dental care, missing or rotten teeth were common, a detail many wouldn’t have wanted featured in their portrait. Dentistry became a more established field in the early 1900s, the same time period when Kodak was marketing its amateur cameras as a way to capture life’s happier, spontaneous moments — smiles included.
In the U.S., California is the top prune-growing state.
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Cameras from the Apollo space missions are still on the moon.
Documenting humankind’s voyage into space has required astronauts to cart cameras outside Earth’s atmosphere, but they haven’t always returned. Cameras used during many of the Apollo missions are still on the moon five decades later, including one used by Neil Armstrong during the first moonwalk. Between 1961 and 1972, NASA crews prepared and sent into space bare-bones cameras, stripped down for efficiency and to reduce user error, but weight requirements for returning to Earth meant astronauts kept only the film, ditching the cameras to make room for moon rocks and other space samples. In 1969, NASA announced that its moon garbage heaps — which would eventually include 12 cameras — totaled about $1 million in abandoned equipment (about $8.1 million today). However, the film brought back to Earth from the Apollo missions captured 18,000 of our first glimpses into space.
Nicole Garner Meeker
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Nicole Garner Meeker is a writer and editor based in St. Louis. Her history, nature, and food stories have also appeared at Mental Floss and Better Report.
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McDonald’s is likely the world’s most popular restaurant, with more than 44,000 locations spread across 100-plus countries. The glow of its golden arches is like a beacon for hungry diners around the world — the company famously boasts that it serves 63 million people every day. However, in one southern Arizona city, it wasn’t always so successful. It took a special sliding window to bring in tons of patrons, particularly those wearing military uniforms. That’s right: The first drive-thru window at McDonald’s was created in 1975 to serve the armed forces.
First known as McDonald’s Famous Bar-B-Q, the fast-food chain ran as a barbecue restaurant for eight years, primarily selling hot dogs, before switching to a burger-first operation in 1948.
Sierra Vista, Arizona, sits about 20 miles from the U.S.-Mexico border and is home to the Fort Huachuca Army base. While military bases are often good for boosting local businesses, management of the town’s McDonald’s realized that service members often passed by the restaurant without stopping. It wasn’t from lack of hunger; uniform regulations of the time prevented personnel from going into public places on personal business while wearing their uniforms. Soldiers interested in stopping for a burger and fries had to return home and change into civilian clothes before they could place an order.
Knowing this, franchise owner David Rich thought up a way his military customers could skirt the rules. Taking inspiration from other restaurants like In-N-Out Burger and Jack in the Box — which were already using drive-thrus — he added a sliding window to the side of his building where customers could order and receive their food without leaving their cars. Rich’s drive-thru — the first in McDonald’s history — caught on with the restaurant chain. Later that year, a second McDonald’s in Georgia added its own drive-thru, followed by another in Oklahoma City, and by 1979, more than half of McDonald’s 5,000 locations featured drive-thrus. Today, nearly 70% of McDonald’s sales come through its drive-thrus, which are visited by service members and civilians alike.
A McDonald’s in Sweden has the world’s only “McSki,” a drive-thru for skiers.
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Fast-food dining inspired automobile manufacturers to add cup holders.
Dining and automobiles have always gone together, but until the 1980s, cup holders weren’t commonly included in cars. The earliest vehicles — such as the Model T — had kitchenettes that could be strapped onto the running boards, and by the 1950s, metal tray-like accessories that hung from dashboards could be used to hold snacks. But these items were meant to be used while cars were parked at diners, drive-ins, or picnic sites, not on the go. As restaurant drive-thrus increased in popularity, more people began eating in their cars while en route to their destinations, and auto manufacturers took notice. In 1983, Chrysler installed the first permanent cup holder in its Dodge Caravan and Plymouth Voyager vans, paving the way for long-distance snacking free(r) from spills.
Nicole Garner Meeker
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Nicole Garner Meeker is a writer and editor based in St. Louis. Her history, nature, and food stories have also appeared at Mental Floss and Better Report.
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Whales are some of the most majestic creatures on the planet. The blue whale is the largest animal to ever exist, the bowhead whale can live for more than 200 years, and a few humpback whales saved the future of humanity in Star Trek IV: The Voyage Home. In fact, these creatures are so amazing that even their earwax is a vital tool — at least for helping scientists understand the mysterious mammals themselves. Take, for instance, the 10-inch-long earplug of an adult blue whale (Balaenoptera musculus). Cetologists — scientists who study whales — can cut into a plug of earwax and learn the whale’s age, much as dendrochronologists do with tree rings. Earwax from blue whales (and other large whales such as humpbacks) forms rings, known as “laminae,” every six months, which give scientists a snapshot of the creature’s entire life through cycles of summer feeding and winter migration.
Fifty million years ago, the early ancestor of all cetaceans walked on four legs. This goatlike mammal, dubbed Pakicetus, lived on riverbanks in India and Pakistan. Slowly, its descendants became more comfortable in water until they eventually evolved into today’s whales.
And these waxy earplugs can tell scientists more than just a whale’s age. Earplugs also capture a chronological “chemical biography” that shows what chemicals and pollutants were found in the animal’s body throughout its life, including levels of the stress hormone cortisol. Scientists have compared whale cortisol levels with whaling data, using records from 1870 to 2016, and found an unmistakable positive correlation. The only discrepancy was during World War II, when whale stress levels increased despite a decrease in whaling overall (scientists assume increased military activity was the likely culprit). Despite a near-international moratorium on whaling in the 1980s, whales still exhibit high cortisol levels thanks to increased ship noise, climate change, and other factors. But with the help of whale earwax, scientists can at least continue to examine the health of these majestic beasts and the oceans they inhabit.
The scientific name for earwax is actually cerumen.
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Using Q-tips to clean your ears is a bad idea.
If you see or feel excess wax in your ear, you should grab a Q-tip, right? Not so fast. Earwax actually plays an important role in auditory health. Produced by the skin in the ear canal, earwax prevents dust and other debris from damaging deeper structures such as the eardrum. However, an excess of earwax can cause “impaction,” which produces symptoms including irritation, hearing loss, and even dizziness. But removing earwax buildup with a cotton swab is not recommended. Otolaryngologists (doctors who treat the ears, neck, throat, and other areas) warn that cotton swabs can actually exacerbate impaction by pushing wax toward the eardrum, where it can harden. If your ears do become impacted, see your local ENT or primary care physician — but don’t toss those Q-tips. You can still use them for cleaning your outer ear or other hard-to-reach spots like faucets, computer keyboards, or car interiors.
Darren Orf
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Darren Orf lives in Portland, has a cat, and writes about all things science and climate. You can find his previous work at Popular Mechanics, Inverse, Gizmodo, and Paste, among others.
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No object — whether made by humans or found in nature — is a mathematically perfect sphere. But that’s not to say that we can’t rank natural objects in terms of their sphericity. For many years, the sun held the record as the roundest known natural object ever measured. But then scientists found a star 5,000 light-years away that’s even rounder.
The sun is roughly 865,000 miles in diameter, yet despite its enormous size, it’s almost perfectly round. The difference between its widest and narrowest points (its equatorial and polar diameters, which differ slightly due to the effects of rotation) is only about 6.2 miles. That makes our star a 99.9997% perfect sphere — a staggering achievement of near-perfect cosmic geometry.
But the sun no longer holds the record. In 2016, a team of astronomers from the Max Planck Institute for Solar System Research announced they had discovered the roundest object ever observed in nature: Kepler 11145123. That hot, luminous A-type star is more than twice the size of the sun and rotates three times more slowly — which partly explains its remarkable shape, as the slower rotation produces less centrifugal flattening.
A cubic inch of water has 120 times more water molecules than there are stars in the observable universe.
A 1-inch cube of water contains about 600 sextillion molecules (written out, that’s "6" followed by 23 zeros). In comparison, the observable universe contains an estimated 5 sextillion stars.
Other factors that could contribute to the star’s roundness include the possibility of a weak magnetic field surrounding the star’s equator (essentially acting as a giant girdle and keeping the star in trim spherical shape) and differential rotation between its core and surface. In other words, the exterior layers of the star could rotate faster than the core, meaning the star may not be spinning as fast as it appears by looking at it from the outside.
Using asteroseismology — the study of the oscillations of stars — the astronomers were able to measure the star’s shape with extraordinary precision. They found the difference between the equatorial and polar radii of the star is a mere 1.86 miles — an astonishingly small number compared to the star’s mean radius of approximately 932,000 miles. When it comes to roundness, Kepler 11145123 will be very hard to top.
Light takes an average of eight minutes and 20 seconds to reach Earth from the surface of the sun.
It may seem as if light from the sun reaches us here on Earth almost instantly, but it actually takes more than eight minutes on average. Considering nothing in the universe travels faster than light, that may seem like quite a long time. But at any given time, Earth is an average of 93 million miles from the sun — a distance even light takes some time to cover.
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