Across
1
Amplified beam of light
3
Particle of light
5
Magnetic metallic element
7
Hottest planet in solar system
11
Disturbance that transfers energy
12
Blocking of light by a celestial body
Down
2
Element found in all living things
4
Gas essential for breathing
6
Ball of burning gas in space
8
Absolute temperature scale unit
9
Curved glass that refracts light
10
Unit of force