correct order of accretion of planetesimals is 1. Masses of matter form around dust grain 2.masses of matter collide 3.atoms and molecules are added to dust grain.
- Conservation of angular momentum explains why the contracting solar nebula's rotation rate increased as it contracted.
- The solar system contains the Sun, eight major bodies called planets, and at least thousands of smaller bodies and denser planets lie closer to the sun.
- The masses of all the planets combined is about 1% of that of the Sun.
- The planet's orbital period is the time it takes to return to the same location in the sky, relative to the Sun.
- Asteroids are the densest form of interplanetary debris
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