Across
1
Curved glass that refracts light
4
Substance with pH above 7
5
Blocking of light by a celestial body
7
Precious yellow metallic element
9
Unit of power
Down
2
Ball of burning gas in space
3
Absolute temperature scale unit
6
Substance with pH below 7
8
Unit of force
10
Gas form of a liquid
11
Preserved remains of ancient life