Across
1
Curved glass that refracts light
3
Push or pull on an object
6
Blocking of light by a celestial body
7
Path of a planet around the sun
9
Force that attracts objects together
Down
2
Natural satellite of Earth
4
Unit of force
5
Biological catalyst
8
Unit of electric potential
10
Substance with pH above 7
11
Solid with repeating atomic pattern