Across
1
Natural satellite of Earth
3
Push or pull on an object
6
Chemical element in table salt
7
Second lightest element
11
Ball of burning gas in space
Down
2
Positive particle in nucleus
4
Absolute temperature scale unit
5
Curved glass that refracts light
8
Preserved remains of ancient life
9
Blocking of light by a celestial body
10
Molten rock beneath Earth surface