Across
1
The Red Planet
4
Chemical element in table salt
5
Compound containing oxygen
7
Our home planet
8
Biological catalyst
Down
2
Mass per unit volume
3
Icy body with a tail near the sun
6
Second lightest element
9
Blocking of light by a celestial body
10
Gas form of a liquid
11
Form of thermal energy
12
Push or pull on an object