Across
1
Absolute temperature scale unit
3
Reddish electrical conductor
5
Our home planet
7
Particle of light
8
Glass that splits light into spectrum
10
Solid with repeating atomic pattern
Down
2
Unit of heredity
4
Tissue that contracts for movement
6
Path of a planet around the sun
9
Blocking of light by a celestial body
11
Positive particle in nucleus
12
Group of similar cells