Across
1
Our home planet
2
Preserved remains of ancient life
3
Basic unit of life
5
Fourth state of matter
8
Chemical element in table salt
9
Positive particle in nucleus
10
Unit of power
12
Ball of burning gas in space
Down
1
Blocking of light by a celestial body
3
Reddish electrical conductor
4
Particle of light
6
Molten rock beneath Earth surface
7
Gas form of a liquid
11
Push or pull on an object
13
Unit of electric potential