Across
1
Basic unit of life
3
Glass that splits light into spectrum
4
Unit of force
7
Path of a planet around the sun
10
Blocking of light by a celestial body
11
Natural satellite of Earth
Down
2
Form of thermal energy
3
Tectonic landmass section
4
Center of an atom or cell
5
Positive particle in nucleus
6
Reddish electrical conductor
8
Force that attracts objects together
9
The Red Planet