Across
1
Amplified beam of light
4
Curved glass that refracts light
5
Solid with repeating atomic pattern
6
Blocking of light by a celestial body
9
Smallest unit of an element
12
Biological catalyst
14
Our home planet
15
Particle of light
Down
2
Fourth state of matter
3
Icy body with a tail near the sun
7
Substance with pH above 7
8
Measure of matter in an object
10
Glass that splits light into spectrum
11
Unit of heredity
13
Path of a planet around the sun