Across
1
Hottest planet in solar system
4
Substance with pH above 7
5
Center of an atom or cell
6
Amplified beam of light
7
Basic unit of life
13
Form of thermal energy
Down
2
Fourth state of matter
3
Blocking of light by a celestial body
8
Push or pull on an object
9
Solid with repeating atomic pattern
10
Element found in all living things
11
Path of a planet around the sun
12
Our home planet