Across
1
Natural satellite of Earth
4
Particle of light
6
Naturally occurring inorganic solid
9
Blocking of light by a celestial body
11
Measure of matter in an object
Down
2
Path of a planet around the sun
3
Unit of heredity
4
Fourth state of matter
5
Compound containing oxygen
7
Icy body with a tail near the sun
8
Absolute temperature scale unit
10
Unit of force
12
Glass that splits light into spectrum