Across
1
Path of a planet around the sun
3
Disturbance that transfers energy
4
Fourth state of matter
6
Icy body with a tail near the sun
8
Biological catalyst
9
Blocking of light by a celestial body
10
Solid with repeating atomic pattern
Down
2
Substance with pH above 7
4
Tectonic landmass section
5
Second lightest element
7
Hottest planet in solar system