Across
1
Blocking of light by a celestial body
5
Gas essential for breathing
8
Force that attracts objects together
9
Chemical element in table salt
10
Our home planet
11
Amplified beam of light
Down
2
Preserved remains of ancient life
3
Form of thermal energy
4
Second lightest element
6
Reddish electrical conductor
7
Unit of energy
12
Push or pull on an object