Across
1
Element found in all living things
4
Ball of burning gas in space
6
Blocking of light by a celestial body
8
Biological catalyst
9
Glass that splits light into spectrum
Down
2
Hottest planet in solar system
3
Measure of matter in an object
5
Reddish electrical conductor
7
Curved glass that refracts light
10
Unit of energy
11
Fourth state of matter