Across
1
Hottest planet in solar system
4
Amplified beam of light
5
Group of similar cells
6
Gas form of a liquid
8
Compound containing oxygen
9
Unit of heredity
Down
2
Blocking of light by a celestial body
3
Glass that splits light into spectrum
7
Nerve cell in the brain
8
Path of a planet around the sun
10
Icy body with a tail near the sun