Across
1
Blocking of light by a celestial body
5
Form of thermal energy
6
Nerve cell in the brain
7
The Red Planet
8
Naturally occurring inorganic solid
Down
2
Absolute temperature scale unit
3
Hottest planet in solar system
4
Fourth state of matter
9
Tissue that contracts for movement
10
Gas form of a liquid
11
Particle of light
12
Biological catalyst