Across
1
Unit of force
4
Blocking of light by a celestial body
6
Preserved remains of ancient life
7
Ball of burning gas in space
8
Icy body with a tail near the sun
Down
2
Basic unit of life
3
Positive particle in nucleus
5
Disturbance that transfers energy
8
Reddish electrical conductor
9
Group of similar cells
10
Center of an atom or cell