Across
1
Hottest planet in solar system
4
Absolute temperature scale unit
6
Positive particle in nucleus
7
Glass that splits light into spectrum
8
Basic unit of life
10
Form of thermal energy
12
Group of similar cells
Down
2
Our home planet
3
Infectious microscopic agent
5
Blocking of light by a celestial body
9
Particle of light
11
Measure of matter in an object