Across
1
Force that attracts objects together
2
Our home planet
4
Second lightest element
6
Tissue that contracts for movement
7
Path of a planet around the sun
11
Unit of energy
Down
2
Blocking of light by a celestial body
3
Nerve cell in the brain
5
Unit of electric potential
8
Measure of matter in an object
9
Hottest planet in solar system
10
Infectious microscopic agent