Across
1
Reddish electrical conductor
3
The Red Planet
4
Amplified beam of light
5
Blocking of light by a celestial body
8
Icy body with a tail near the sun
11
Chemical element in table salt
12
Hottest planet in solar system
Down
2
Unit of force
3
Tissue that contracts for movement
6
Particle of light
7
Mass per unit volume
9
Fourth state of matter
10
Glass that splits light into spectrum