Across
1
Preserved remains of ancient life
2
Reddish electrical conductor
5
Force that attracts objects together
7
The Red Planet
8
Blocking of light by a celestial body
9
Unit of energy
Down
2
Basic unit of life
3
Infectious microscopic agent
4
Path of a planet around the sun
6
Hottest planet in solar system
10
Amplified beam of light