100 !
4.comets a.it is the largest object you can see in the night sky
5.craters b.a small, frozen mass of dust and gas revolving around the sun
6.moon c.they are holes made when a large moving rock hit the moon

4 - B

5 - C

6 - A

Comets - a small, frozen mass of dust and gas revolving around the sun.

Craters - they are holes made when a large moving rock hit the moon.

Moon - it is the largest object you can see in the night sky.