Across
1
Glass that splits light into spectrum
4
Absolute temperature scale unit
5
Blocking of light by a celestial body
7
Unit of force
10
The Red Planet
Down
2
Nerve cell in the brain
3
Group of similar cells
6
Substance with pH above 7
7
Center of an atom or cell
8
Compound containing oxygen
9
Chemical element in table salt
11
Tissue that contracts for movement
12
Ball of burning gas in space