Across
1
Biological catalyst
3
Ball of burning gas in space
6
Molten rock beneath Earth surface
7
Path of a planet around the sun
11
Blocking of light by a celestial body
Down
2
Solid with repeating atomic pattern
4
Amplified beam of light
5
Nerve cell in the brain
8
Glass that splits light into spectrum
9
Unit of heredity
10
Element found in all living things