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In the weightlessness of orbit, an astronaut's heart can become more spherical as it no longer works against gravity in the usual way, while their spine stretches enough to make them measurably taller before they return to Earth.
2+ hour, 6+ min ago (220+ words) Freed from gravity, the body changes shape: a 2014 study found astronauts' hearts became about 9. 4% more spherical, and spinal discs expand enough to add up to 3% in height. Both are temporary and reversible, and both reveal how much of our shape…...
A Greenland shark studied in 2016 was estimated to be nearly 400 years old, meaning it may have been born around the time Shakespeare's era was ending " and, astonishingly, would not have reached sexual maturity for more than another century.
8+ hour, 49+ min ago (48+ words) A 2016 study radiocarbon-dated Greenland shark eye lenses; the largest came out at about 392 years old, with a margin of 120 years either way, making it the longest-lived vertebrate known. It would not have reached sexual maturity until around 150. The numbers, and…...
HD 189733b looks deep blue from space, almost Earth-like at first glance " but its colour comes not from oceans, but from silicate particles in a scorching atmosphere where glass may rain sideways through winds of thousands of kilometres an hour.
9+ hour, 46+ min ago (46+ words) HD 189733b is a deep cobalt blue, the first exoplanet to have its visible colour measured (Hubble, 2013). But the blue comes from silicate hazes, not oceans, in an atmosphere above 1, 000 C with winds near 7, 000 km/h. Same colour as Earth, opposite cause....
A Venusian day is 243 Earth days long " longer than the planet's entire 225-day year " and because Venus rotates backwards, the Sun would rise in the west and set in the east, though only once every 117 Earth days through its thick, cloud-choked sky.
14+ hour, 11+ min ago (50+ words) Venus spins once every 243 Earth days, longer than its 225-day year, and backwards. But sunrise to sunrise takes only about 117 Earth days, because the orbital motion and slow retrograde spin pull against each other. And through its opaque clouds, a…...
The oldest solid material ever found on Earth didn't come from Earth at all " it was locked inside a meteorite that landed near Murchison, Victoria in 1969, and the stardust grains inside formed roughly 7 billion years ago, before the Sun existed.
2+ day, 23+ hour ago (193+ words) The Murchison meteorite, which fell in Victoria in 1969, holds presolar silicon carbide grains. A 2020 study dated them by cosmic-ray exposure: most formed shortly before the Sun, the oldest about 7 billion years ago. How the dating works, and why 7 billion is…...
Vietnam's Son Doong is the world's largest cave passage, with a volume of about 38. 5 million cubic meters and sections reaching 200 meters high and 150 meters wide, large enough that a 40-story skyscraper could stand inside it
1+ week, 1+ day ago (127+ words) ...
Singapore's Marina Barrage transformed a polluted tidal estuary into a freshwater reservoir in the heart of the city in 2008, holding back the sea with a dam so the captured rainwater could supply drinking water and tame floods in the downtown core
1+ week, 2+ day ago (64+ words) When Singapore opened the Marina Barrage on 31 October 2008, it sealed off a tidal estuary in the middle of the financial district with nine 70-tonne gates and seven giant drainage pumps. The dam turned a polluted river mouth into a freshwater…...
Antarctica is the largest desert on the planet, because a desert is defined by how little water falls from the sky rather than by heat, and almost nothing falls on the frozen continent.
1+ week, 6+ day ago (64+ words) ...
The International Space Station circles the planet so fast that the crew watch the sun rise and set sixteen times in a single day, a new dawn roughly every ninety minutes
2+ week, 9+ hour ago (92+ words) ...
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