Across
1
Particle of light
5
Amplified beam of light
6
Disturbance that transfers energy
8
Push or pull on an object
10
Preserved remains of ancient life
Down
2
Force that attracts objects together
3
Gas essential for breathing
4
Blocking of light by a celestial body
7
Reddish electrical conductor
9
Absolute temperature scale unit
11
Nerve cell in the brain