Across
1
Particle of light
5
Preserved remains of ancient life
6
Compound containing oxygen
7
Our home planet
8
Tissue that contracts for movement
9
Path of a planet around the sun
11
Magnetic metallic element
12
Absolute temperature scale unit
13
Hottest planet in solar system
Down
2
Unit of power
3
Blocking of light by a celestial body
4
Nerve cell in the brain
10
Solid with repeating atomic pattern