Across
1
Positive particle in nucleus
5
Amplified beam of light
6
Ball of burning gas in space
9
Tissue that contracts for movement
10
Blocking of light by a celestial body
11
Disturbance that transfers energy
Down
2
Path of a planet around the sun
3
Hottest planet in solar system
4
Our home planet
7
Smallest unit of an element
8
Unit of energy
12
Measure of matter in an object
13
Molten rock beneath Earth surface
14
Particle of light