Across
1
Ball of burning gas in space
3
Gas essential for breathing
5
Blocking of light by a celestial body
6
The Red Planet
11
Infectious microscopic agent
13
Unit of electric potential
Down
2
Our home planet
4
Force that attracts objects together
6
Measure of matter in an object
7
Biological catalyst
8
Hottest planet in solar system
9
Absolute temperature scale unit
10
Tissue that contracts for movement
12
Element found in all living things