Across
1
Path of a planet around the sun
4
Curved glass that refracts light
6
Biological catalyst
7
Icy body with a tail near the sun
8
Particle of light
10
Absolute temperature scale unit
Down
2
Blocking of light by a celestial body
3
Natural satellite of Earth
5
Measure of matter in an object
9
Tectonic landmass section
11
Solid with repeating atomic pattern