Across
1
Substance with pH above 7
4
Ball of burning gas in space
5
Mass per unit volume
6
Element found in all living things
7
Solid with repeating atomic pattern
8
Second lightest element
Down
2
Hottest planet in solar system
3
Blocking of light by a celestial body
7
Icy body with a tail near the sun
9
Substance with pH below 7
10
Absolute temperature scale unit