Across
1
Compound containing oxygen
5
Icy body with a tail near the sun
6
Tectonic landmass section
7
Solid with repeating atomic pattern
8
Measure of matter in an object
9
Particle of light
Down
2
Unit of force
3
Force that attracts objects together
4
Blocking of light by a celestial body
10
Second lightest element
11
The Red Planet