Across
1
Group of similar cells
5
Icy body with a tail near the sun
6
Hottest planet in solar system
7
Fourth state of matter
9
Unit of force
12
Smallest unit of an element
Down
2
Unit of power
3
Unit of energy
4
Blocking of light by a celestial body
8
Gas form of a liquid
10
Magnetic metallic element
11
Naturally occurring inorganic solid