Across
1
Icy body with a tail near the sun
3
Gas form of a liquid
4
Infectious microscopic agent
6
Natural satellite of Earth
9
Blocking of light by a celestial body
10
Force that attracts objects together
12
Unit of electric potential
Down
1
Reddish electrical conductor
2
Smallest unit of an element
5
Path of a planet around the sun
7
Disturbance that transfers energy
8
Absolute temperature scale unit
11
Ball of burning gas in space