Across
1
Unit of heredity
4
Glass that splits light into spectrum
5
Icy body with a tail near the sun
7
Curved glass that refracts light
10
Preserved remains of ancient life
Down
2
Our home planet
3
Naturally occurring inorganic solid
6
Blocking of light by a celestial body
8
Unit of energy
9
Absolute temperature scale unit
11
Fourth state of matter