Across
1
Amplified beam of light
2
Second lightest element
4
Preserved remains of ancient life
6
Force that attracts objects together
7
Center of an atom or cell
Down
2
Form of thermal energy
3
Blocking of light by a celestial body
5
Molten rock beneath Earth surface
8
Icy body with a tail near the sun
9
Hottest planet in solar system