Across
1
Blocking of light by a celestial body
5
Force that attracts objects together
8
Basic unit of life
9
Glass that splits light into spectrum
10
Unit of force
11
Path of a planet around the sun
Down
2
Unit of heredity
3
Reddish electrical conductor
4
Unit of electric potential
6
Push or pull on an object
7
Ball of burning gas in space
9
Particle of light
12
Substance with pH below 7
13
Disturbance that transfers energy