Across
1
Glass that splits light into spectrum
3
Center of an atom or cell
5
Substance with pH below 7
8
Push or pull on an object
10
Absolute temperature scale unit
11
Form of thermal energy
Down
1
Particle of light
2
Curved glass that refracts light
4
Blocking of light by a celestial body
6
The Red Planet
7
Ball of burning gas in space
9
Group of similar cells