Across
1
Ball of burning gas in space
3
Unit of energy
6
Our home planet
7
Particle of light
8
Solid with repeating atomic pattern
11
Preserved remains of ancient life
12
Blocking of light by a celestial body
Down
2
Curved glass that refracts light
4
Smallest unit of an element
5
Chemical element in table salt
6
Biological catalyst
9
Push or pull on an object
10
Gas form of a liquid
13
Amplified beam of light