Across
1
The Red Planet
4
Chemical element in table salt
6
Ball of burning gas in space
8
Glass that splits light into spectrum
9
Blocking of light by a celestial body
13
Push or pull on an object
Down
2
Gas form of a liquid
3
Group of similar cells
5
Naturally occurring inorganic solid
7
Fourth state of matter
10
Curved glass that refracts light
11
Magnetic metallic element
12
Unit of force