Across
1
Tissue that contracts for movement
4
Absolute temperature scale unit
6
Blocking of light by a celestial body
7
Amplified beam of light
Down
2
Preserved remains of ancient life
3
Unit of heredity
5
Hottest planet in solar system
8
Naturally occurring inorganic solid
9
Unit of electric potential
10
Chemical element in table salt
11
Icy body with a tail near the sun
12
Biological catalyst