Across
1
Particle of light
4
Blocking of light by a celestial body
5
Force that attracts objects together
8
The Red Planet
9
Group of similar cells
10
Reddish electrical conductor
Down
2
Gas form of a liquid
3
Gas essential for breathing
6
Compound containing oxygen
7
Tectonic landmass section
8
Natural satellite of Earth
11
Push or pull on an object