Across
1
Positive particle in nucleus
4
Ball of burning gas in space
6
Magnetic metallic element
7
Blocking of light by a celestial body
9
Particle of light
10
Precious yellow metallic element
Down
2
Our home planet
3
Preserved remains of ancient life
5
Infectious microscopic agent
8
Unit of force
11
Element found in all living things
12
Measure of matter in an object