Across
1
Second lightest element
3
Amplified beam of light
6
Force that attracts objects together
7
Tectonic landmass section
8
Curved glass that refracts light
Down
2
Solid with repeating atomic pattern
4
Icy body with a tail near the sun
5
Ball of burning gas in space
7
Particle of light
9
Center of an atom or cell