scientists generally believe that the original source of comets is:
-the sun itself
-the inner planets
- the outer planets
-The moons of the planets

A scientist is using a telescope and sees a comet that has a tail. What can the surmise about the comet?
-it came from the oort cloud
-it came from the kuiper belt -it has a retrograde orbit
-it is close and approaching the sun

what is the nucleus of a comet made of?
-dark ice
-bright metal
-Black dust
-lightlight gasses


if a comet were so large that its mass generated more gravity, then what would happen?
-it wouldn't orbit the sun
-it would've become an asteroid
-it wouldn't have a tail
-it would have become a meteor

the tails of the comets are formed as____ escape from the _____.
- gas and dust; coma
-ice and gas; surface
-ice and dust; nucleus
-dust and ice; coma


most asteroids orbit the sun between :
-mercury and venus
- mars and iupiter
-neptune and pluto
-saturn and uranus


which planets formation was most responsible for the creation of asteroids in our solar system ?
-Jupiter
- Saturn
-mars
-Uranus


what is the best description of an asteroid?
-they are remains of icy planetoids
-they are remains of planetary collisions
-they are protoplanets with too little mass
-they are Debris from the outer planets