Chapter 8 Continued

3 Pages

Astronomy & Astrophysics
Course Code
Stefan Mochnacki

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8.4: The Aftermath of Planet Formation Where did Asteroids and Comets Come From? Asteroids are leftover planetismals of the inner solar system Probably enough objects in the asteroid belt to from another terrestrial planet in the past but because most of them crashed into the inner planets, that is no longer possible. Comets, are icy left over planetismals of the outer solar system, and must have initially populated the entire outer solar system beyond Neptune Object orbiting beyond Neptune should have been able to grow in size without any disruption, some growing large enough to be considered dwarf planets; they now occupy the Kuiper belt. Close encounters with Jovian planets caused comets to suffer close gravitational encounters causing them to be kicked out into random orbit far from the Sun, which is why they now populate the Oort cloud The Heavy Bombardment: Impact crater played a critical role
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