Across
1
Blocking of light by a celestial body
2
Natural satellite of Earth
5
Chemical element in table salt
7
Curved glass that refracts light
8
Nerve cell in the brain
9
Solid with repeating atomic pattern
11
Hottest planet in solar system
Down
2
Measure of matter in an object
3
Path of a planet around the sun
4
Icy body with a tail near the sun
6
Mass per unit volume
8
Center of an atom or cell
10
The Red Planet