Across
1
Center of an atom or cell
4
Natural satellite of Earth
5
Solid with repeating atomic pattern
6
Icy body with a tail near the sun
7
Ball of burning gas in space
Down
2
Amplified beam of light
3
Mass per unit volume
4
The Red Planet
Center of an atom or cell
Natural satellite of Earth
Solid with repeating atomic pattern
Icy body with a tail near the sun
Ball of burning gas in space
Amplified beam of light
Mass per unit volume
The Red Planet