Across
1
Icy body with a tail near the sun
3
Curved glass that refracts light
5
Substance with pH below 7
7
Our home planet
8
Tectonic landmass section
10
Natural satellite of Earth
Down
2
Fourth state of matter
4
Blocking of light by a celestial body
6
Glass that splits light into spectrum
9
Amplified beam of light