Across
1
Unit of heredity
3
The Red Planet
4
Ball of burning gas in space
6
Curved glass that refracts light
9
Unit of electric potential
11
Form of thermal energy
12
Amplified beam of light
14
Chemical element in table salt
Down
2
Mass per unit volume
5
Blocking of light by a celestial body
7
Hottest planet in solar system
8
Infectious microscopic agent
10
Glass that splits light into spectrum
13
Unit of power