Across
1
Amplified beam of light
4
Blocking of light by a celestial body
6
Smallest unit of an element
9
Natural satellite of Earth
10
Hottest planet in solar system
Down
2
Substance with pH above 7
3
Curved glass that refracts light
5
Icy body with a tail near the sun
7
Solid with repeating atomic pattern
8
Positive particle in nucleus