Across
1
Particle of light
2
Natural satellite of Earth
5
Force that attracts objects together
6
Group of similar cells
7
Unit of force
9
Glass that splits light into spectrum
Down
2
Naturally occurring inorganic solid
3
Gas essential for breathing
4
Icy body with a tail near the sun
8
The Red Planet
9
Positive particle in nucleus
10
Unit of power