Across
1
Reddish electrical conductor
4
Hottest planet in solar system
5
Blocking of light by a celestial body
9
Group of similar cells
10
Smallest unit of an element
11
Basic unit of life
Down
2
Amplified beam of light
3
Center of an atom or cell
6
Precious yellow metallic element
7
Naturally occurring inorganic solid
8
Unit of heredity