Across
1
Blocking of light by a celestial body
4
Measure of matter in an object
5
Center of an atom or cell
7
Amplified beam of light
10
Push or pull on an object
11
Tissue that contracts for movement
12
Unit of energy
Down
2
Tectonic landmass section
3
Infectious microscopic agent
4
Naturally occurring inorganic solid
6
Unit of heredity
8
Icy body with a tail near the sun
9
Our home planet