Across
1
Amplified beam of light
4
Unit of energy
7
Element found in all living things
8
Unit of power
11
Preserved remains of ancient life
12
Mass per unit volume
Down
2
Unit of electric potential
3
Blocking of light by a celestial body
5
Hottest planet in solar system
6
Push or pull on an object
9
Precious yellow metallic element
10
The Red Planet