Across
1
Hottest planet in solar system
3
Our home planet
5
Path of a planet around the sun
9
Fourth state of matter
10
Unit of electric potential
11
Blocking of light by a celestial body
12
Glass that splits light into spectrum
Down
2
Group of similar cells
4
Unit of force
6
Substance with pH above 7
7
Tectonic landmass section
8
Icy body with a tail near the sun