Across
1
Blocking of light by a celestial body
4
Magnetic metallic element
6
Preserved remains of ancient life
8
Icy body with a tail near the sun
10
Hottest planet in solar system
12
Precious yellow metallic element
Down
2
Naturally occurring inorganic solid
3
Second lightest element
5
Group of similar cells
7
Unit of energy
9
Natural satellite of Earth
11
Mass per unit volume
13
Gas essential for breathing