Across
1
Gas form of a liquid
3
Particle of light
5
Blocking of light by a celestial body
8
Measure of matter in an object
9
Tissue that contracts for movement
11
Smallest unit of an element
Down
2
Path of a planet around the sun
4
Center of an atom or cell
6
Amplified beam of light
7
Absolute temperature scale unit
10
Solid with repeating atomic pattern