Across
1
Blocking of light by a celestial body
2
Curved glass that refracts light
5
Ball of burning gas in space
6
Compound containing oxygen
8
Chemical element in table salt
11
Element found in all living things
Down
2
Amplified beam of light
3
Infectious microscopic agent
4
Reddish electrical conductor
7
Unit of power
9
Our home planet
10
Group of similar cells