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Dinesh

Dinesh club

Posted: 13 Mar 2021

Taken: 06 Mar 2021

1 favorite     3 comments    25 visits

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Keywords

Excerpt •
Evolution - The triumph of an idea •
Author •
Carl Zimmer •
End Times •
Bryan Walsh •

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Asteroid Impact

Asteroid Impact
Meteor Crater in Arizona was created 50,000 years ago by the impact of a meteorite -- a relic of the early solar system. by analyzing the meteorite, scientists determined that the Earth is 4.55 billion years old

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 Dinesh
Dinesh club
The rocks at Acasta are the oldest known rocks on the planet, but they formed when Earth was already 500 million years old. Geologists needed a gift from space to find out the true age of the planet. In the 1940s they began studying the isotopes of lead in meteorites. Most meteorites are jumbles of space junk left behind from the formation of solar system. In 1953 Claire Patterson, a geologist at the California Institute of Technology, measured the lead and uranium in the meteorite that had carved out the 1.2-kilometer-wide Meteor Crater in Arizona. It had practically no uranium left in it, because most of the atoms had turned into lead. This meteorite had formed at the dawn of the solar system and had circled the sun essentially unchanged ever since. ~ Page 63
3 years ago.
 Dinesh
Dinesh club
That we rarely notice asteroid impacts in part a sign of just how empty space is -- by one estimate, only 0.0000000000000000000042 (20 zeros after the decimal) percent of the universe actually contains matter. But in truth we’re under near-constant bombardment, though mostly by the cosmic equivalent of BBs. Each day the Earth is battered by almost 100 tons of dust and sand-sized particles; keep a close enough watch on the night sky and you’ll see the larger pieces flaring briefly as they burn up in the atmosphere as what we call, inaccurately, shooting stars. The size and number of asteroids in the solar system follows a proportional relationship called a power law, so the smaller asteroids are far more numerous than large ones. That’s why it has been easier for NASA to locate asteroids above 1 kilometer than it has been to locate those above 140 meters -- the big ones are bigger, so they were easier to spot, and there are fewer of them to find. `page 27 (Excerpt: “End Times” Bryan Walsh (Author)
3 years ago. Edited 13 months ago.
 Nouchetdu38
Nouchetdu38 club
Very interesting and amazing!!!!!!!
3 years ago.

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