Across
1
Path of a planet around the sun
4
Amplified beam of light
5
Magnetic metallic element
8
Our home planet
10
The Red Planet
Down
2
Tectonic landmass section
3
Force that attracts objects together
6
Ball of burning gas in space
7
Unit of energy
9
Chemical element in table salt
11
Infectious microscopic agent
12
Second lightest element