Day: February 3, 2021

new like on twitter.com February 03, 2021 at 05:37PM

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Found on the Moon: Candidate for Oldest Known Earth Rock

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Was the oldest known rock on Earth found on the Moon? Quite possibly. The story opens with the Apollo 14 lunar mission. Lunar sample 14321, a large rock found in Cone crater by astronaut Alan Shepard, when analyzed back on Earth, was found to have a fragment that was a much better match to Earth rocks than other Moon rocks. Even more surprising, that rock section has recently been dated back 4 billion years, making it older, to within measurement uncertainty, than any rock ever found on Earth. A leading hypothesis now holds that an ancient comet or asteroid impact launched Earth rocks into the Solar System, some of which fell back to the Moon, became mixed with heated lunar soil and other rocks, cooled, and re-fragmented. The video features an internal X-ray scan of 14321 showing multiple sections with markedly different chemistries. Moon rocks will continue to be studied to learn a more complete history of the Moon, the Earth, and the early Solar System. Friday marks the 50th Anniversary of the Apollo 14 landing on the Moon. via NASA https://ift.tt/3jjtzuH

new like on twitter.com February 02, 2021 at 11:51PM

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Wikipedia article of the day for February 3, 2021

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Wikipedia article of the day is Bee-eater. Check it out: https://ift.tt/1Oe7SpB Summary: The bee-eaters are near passerine birds of the family Meropidae, containing three genera and twenty-seven species. Most species are found in Africa and Asia, with a few in southern Europe, Australia, and New Guinea. They are characterised by richly coloured plumage and slender bodies, and usually by elongated central tail feathers. All have long down-turned bills and medium to long wings, which may be pointed or round. They predominantly eat flying insects, caught on the wing from an open perch. Most bee-eaters are gregarious, forming colonies and nesting in burrows. The eggs are white, with typically five to the clutch. Most species are monogamous, and both parents care for the young, sometimes with assistance from related birds in the colony. Bee-eaters may be killed by raptors; their nests are raided by rodents and snakes, and they can carry various parasites. Some species are adversely affected by human activity or habitat loss, but none are threatened.