Across
1
Icy body with a tail near the sun
4
Unit of energy
5
Preserved remains of ancient life
6
Reddish electrical conductor
7
Disturbance that transfers energy
11
Chemical element in table salt
Down
2
Unit of force
3
Blocking of light by a celestial body
8
Infectious microscopic agent
9
Glass that splits light into spectrum
10
Biological catalyst