Articles with 400-600 Words

While scientists have managed to recover and examine thousands of meteorites, finding their origin or even whether they are from icy comets or rocky asteroids has proved elusive. Now, for the first time, a team of international researchers has traced the source of a boulder-sized rock that landed in Botswana to an asteroid named Vesta. Boasting a diameter of about 326 miles, it is one of the largest and brightest rocks in the asteroid belt that circles the Sun between Jupiter and Mars....

Simone Biles, the world's most decorated gymnast, is well-known for performing moves so tricky and unique that many have been named after her. On May 22, 2021, the 24-year-old phenom made history again by becoming the first woman to perform a Yurchenko double pike in a competition. Even more impressive, the US Classic in Indianapolis, where Biles' accomplished the feat, was the gymnast's first meet since the COVID-19 pandemic caused all events to be canceled in early 2020....

The quarter dollar is both the most commonly-used coin in the American currency and the most unique. Since 1999, the coin's reverse, or "tails," side has showcased all 50 US states, as well as the breathtaking beauty of the country's national parks. Now, the US Mint plans to use the silver canvas to celebrate female leaders who have played a crucial part in shaping the nation's history....

Memorial Day, which will be celebrated on May 31, 2021, is one of the most important American holidays. Observed annually on the last Monday of May, it honors the brave men and women of the US Army, Navy, Marine Corps, National Guard, Air Force, and the Coast Guard who sacrificed their lives to defend America's freedom. Meanwhile, Veterans Day, which takes place each year on November 11, honors all veterans — living or dead—but mainly gives thanks to living veterans who served their country honorably during war or peacetime....

While total lunar eclipses are always spectacular, the one on May 26, 2021, promises to be particularly memorable given that it coincides with a supermoon. This means that the Moon — which will be at perigee, or its closest distance to Earth — will appear about 7 percent larger and 15 percent brighter than a standard full Moon. The eclipse will be most visible from the western parts of the Americas, Australia and New Zealand, and Eastern Asia. In the US, the best views will be reserved for Hawaii, Alaska, and the western states....

A collection of 1,000 prehistoric structures dubbed mustatils — the plural form of the Arabic term for rectangles — scattered across 124,274 miles (200,000 kilometers) in northwest Saudi Arabia may be the world's oldest monuments. A team of archeologists from the University of Western Australia (UWA) reached this conclusion after radiocarbon dating of charcoal found inside the courtyards indicated they were constructed in 5,000 BC — or about 2,000 years before the Egyptian pyramids or monuments like Stonehenge in southern England....

Geologists have long maintained that our Earth comprises four layers — the crust, the mantle, the outer core, and, the deepest layer, the inner core. However, a team of scientists led by Jo Stephenson, a doctoral student in seismology at Australian National University in Canberra, now asserts that our planet may be harboring a mysterious, fifth layer — an "inner-inner" core as well....

Researchers worldwide are celebrating the discovery of the fossil of an adult oviraptorosaur brooding over a nest of eggs containing unhatched babies. The unprecedented discovery confirms scientists' suspicions that the two-legged bird-like dinosaurs were doting parents, which not only incubated their eggs, but also guarded them —at times putting their own lives at risk....

When Jennifer Johnson and her team embarked on their annual quest to survey the sturgeon population in the Detroit River in mid-April 2021, they had fully expected to find some super-sized specimens. However, the U.S. Fish and Wildlife Service biologists had never anticipated luring in the granddaddy of all sturgeons — a massive, 240-pound, 6-foot, 10-inch long fish that they estimate is at least a century old!...