Across
1
Blocking of light by a celestial body
3
Nerve cell in the brain
5
Unit of power
6
The Red Planet
7
Gas essential for breathing
Down
2
Substance with pH above 7
3
Unit of force
4
Amplified beam of light
8
Substance with pH below 7
9
Reddish electrical conductor
10
Icy body with a tail near the sun
11
Biological catalyst