Across
1
Element found in all living things
4
Magnetic metallic element
5
Icy body with a tail near the sun
6
Blocking of light by a celestial body
9
Our home planet
Down
1
Basic unit of life
2
Absolute temperature scale unit
3
The Red Planet
7
Force that attracts objects together
8
Substance with pH below 7
10
Positive particle in nucleus
11
Group of similar cells