Across
1
Blocking of light by a celestial body
6
Absolute temperature scale unit
7
Compound containing oxygen
8
Reddish electrical conductor
9
The Red Planet
10
Hottest planet in solar system
11
Our home planet
15
Measure of matter in an object
Down
2
Particle of light
3
Amplified beam of light
4
Center of an atom or cell
5
Substance with pH above 7
12
Biological catalyst
13
Unit of power
14
Substance with pH below 7