Nuclear physicist Tim Gregory explains why meteorites are marvellous.
We were one of these giant interstellar clouds. And then, about four and a half billion years ago, a small clump of that cloud began to collapse in on itself.
As the centre of that cloud became denser and denser, its gravitational field strength grew and grew, and so the collapse spiralled in a runaway. Most of that material, about 99.9% of it, formed the Sun. The leftovers formed the planets and everything else – moons, comets, and asteroids. Meteorites are the leftover debris from that era of planet formation. They’re small fragments of asteroids. They pre-date the planets, making themAnd in physics, what’s true for a cup of tea is true for an asteroid. Small objects cool down much quicker than big objects. Asteroids, therefore, lost their heat very quickly after they formed at the beginning of the solar system. Since then, they’ve remained virtually unchanged.
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