Across
1
Reddish electrical conductor
4
Unit of power
5
Amplified beam of light
6
Substance with pH above 7
9
Unit of heredity
13
Group of similar cells
Down
2
Push or pull on an object
3
Ball of burning gas in space
7
The Red Planet
8
Blocking of light by a celestial body
10
Glass that splits light into spectrum
11
Unit of energy
12
Absolute temperature scale unit