Across
1
Icy body with a tail near the sun
4
Blocking of light by a celestial body
5
Tissue that contracts for movement
6
Ball of burning gas in space
7
Center of an atom or cell
Down
1
Solid with repeating atomic pattern
2
Naturally occurring inorganic solid
3
Unit of energy
8
Hottest planet in solar system
9
Particle of light
10
Path of a planet around the sun