Across
1
Natural satellite of Earth
2
Particle of light
3
Form of thermal energy
6
Naturally occurring inorganic solid
7
Gas form of a liquid
10
Path of a planet around the sun
11
Blocking of light by a celestial body
Down
2
Fourth state of matter
4
Unit of heredity
5
Our home planet
8
Glass that splits light into spectrum
9
Element found in all living things