Across
1
Force that attracts objects together
4
Glass that splits light into spectrum
5
Natural satellite of Earth
7
Measure of matter in an object
9
Infectious microscopic agent
12
Unit of electric potential
13
Unit of power
Down
2
Chemical element in table salt
3
The Red Planet
6
Path of a planet around the sun
8
Center of an atom or cell
10
Absolute temperature scale unit
11
Ball of burning gas in space