Across
1
Positive particle in nucleus
4
Our home planet
6
Tissue that contracts for movement
7
Icy body with a tail near the sun
9
Blocking of light by a celestial body
11
Particle of light
12
The Red Planet
Down
2
Push or pull on an object
3
Force that attracts objects together
5
Center of an atom or cell
6
Naturally occurring inorganic solid
8
Group of similar cells
10
Second lightest element
13
Unit of heredity
14
Measure of matter in an object