Across
1
The Red Planet
3
Our home planet
6
Basic unit of life
7
Precious yellow metallic element
9
Amplified beam of light
11
Hottest planet in solar system
Down
2
Unit of power
4
Unit of force
5
Curved glass that refracts light
8
Unit of heredity
10
Blocking of light by a celestial body
12
Mass per unit volume