Across
1
Icy body with a tail near the sun
3
Infectious microscopic agent
4
The Red Planet
6
Compound containing oxygen
9
Unit of power
10
Curved glass that refracts light
Down
2
Ball of burning gas in space
4
Measure of matter in an object
5
Tissue that contracts for movement
7
Glass that splits light into spectrum
8
Amplified beam of light
11
Blocking of light by a celestial body