Across
1
Disturbance that transfers energy
3
Infectious microscopic agent
5
Natural satellite of Earth
8
Unit of electric potential
9
Blocking of light by a celestial body
11
Ball of burning gas in space
Down
2
The Red Planet
4
Unit of energy
6
Path of a planet around the sun
7
Nerve cell in the brain
10
Chemical element in table salt
12
Force that attracts objects together