Across
1
Solid with repeating atomic pattern
3
Gas essential for breathing
5
Icy body with a tail near the sun
7
Unit of heredity
10
Ball of burning gas in space
Down
2
Positive particle in nucleus
4
Blocking of light by a celestial body
6
Curved glass that refracts light
8
Hottest planet in solar system
9
Smallest unit of an element