Across
1
Ball of burning gas in space
2
Curved glass that refracts light
3
Gas form of a liquid
7
Tissue that contracts for movement
9
Solid with repeating atomic pattern
10
Unit of force
11
Group of similar cells
Down
2
Amplified beam of light
3
Unit of electric potential
4
Smallest unit of an element
5
Natural satellite of Earth
6
Positive particle in nucleus
8
Blocking of light by a celestial body