Across
1
Amplified beam of light
3
Icy body with a tail near the sun
7
Fourth state of matter
10
Blocking of light by a celestial body
11
Precious yellow metallic element
Down
2
Biological catalyst
4
Basic unit of life
5
Hottest planet in solar system
6
Reddish electrical conductor
8
Gas form of a liquid
9
Substance with pH below 7