As of 2012, how many near-Earth asteroids, with sizes over 1km, had been discovered by the Spaceguard survey?   a Only a few dozen b Nearly 1000 c Nearly 50,000 d About 500

What is the defining property of the Trojan asteroids? Group of answer choices They have orbits that cross the orbit of the Earth.   They have orbits beyond Neptune.   They have a composition that is the most primitive of all asteroids.   They are located within the orbit of Jupiter, 60 degrees ahead of or behind it.   They were all named by the early Greeks.

What is the evidence that suggests asteroids might have geologically active surfaces?

The material ejected from the surface of asteroid would have a significant momentum. Since asteroid and all its material is _____, the ejection would cause _____ change in momentum of the asteroid, according to the ____. The ejected material is analogous to _____, and the asteroid is analogous to ____. Fill in the blank -oppositely directed -law of conservation of energy -gases expelled from a rocket -an isolated system -a rocket -law of conservation of momentum -perpendicularly directed