Across
1
Unit of power
3
Nerve cell in the brain
4
Path of a planet around the sun
5
Measure of matter in an object
9
Biological catalyst
11
Push or pull on an object
Down
2
The Red Planet
3
Unit of force
6
Hottest planet in solar system
7
Smallest unit of an element
8
Chemical element in table salt
10
Icy body with a tail near the sun