Across
1
Absolute temperature scale unit
4
Basic unit of life
5
Substance with pH above 7
6
Our home planet
7
Amplified beam of light
8
Force that attracts objects together
11
Positive particle in nucleus
Down
2
Fourth state of matter
3
Curved glass that refracts light
6
Blocking of light by a celestial body
9
Form of thermal energy
10
Particle of light