Across
1
Smallest unit of an element
4
Blocking of light by a celestial body
5
Amplified beam of light
6
Curved glass that refracts light
8
Magnetic metallic element
9
Icy body with a tail near the sun
11
Preserved remains of ancient life
Down
2
Solid with repeating atomic pattern
3
Compound containing oxygen
7
The Red Planet
10
Positive particle in nucleus