Across
1
Natural satellite of Earth
3
Particle of light
4
Center of an atom or cell
5
Path of a planet around the sun
6
Precious yellow metallic element
9
Icy body with a tail near the sun
10
Blocking of light by a celestial body
Down
2
Compound containing oxygen
3
Positive particle in nucleus
7
Element found in all living things
8
Tectonic landmass section