Across
1
The Red Planet
3
Nerve cell in the brain
5
Glass that splits light into spectrum
6
Absolute temperature scale unit
7
Push or pull on an object
12
Path of a planet around the sun
13
Tissue that contracts for movement
Down
2
Hottest planet in solar system
4
Solid with repeating atomic pattern
5
Particle of light
8
Force that attracts objects together
9
Blocking of light by a celestial body
10
Reddish electrical conductor
11
Unit of force