Across
1
Force that attracts objects together
4
Particle of light
5
Push or pull on an object
10
Natural satellite of Earth
12
Blocking of light by a celestial body
Down
2
Gas essential for breathing
3
Glass that splits light into spectrum
6
Substance with pH above 7
7
Chemical element in table salt
8
Gas form of a liquid
9
Form of thermal energy
11
Absolute temperature scale unit