Across
1
Disturbance that transfers energy
3
Icy body with a tail near the sun
6
Tissue that contracts for movement
7
Amplified beam of light
Down
2
Center of an atom or cell
4
Second lightest element
5
Ball of burning gas in space
8
Our home planet
Disturbance that transfers energy
Icy body with a tail near the sun
Tissue that contracts for movement
Amplified beam of light
Center of an atom or cell
Second lightest element
Ball of burning gas in space
Our home planet