Across
1
Disturbance that transfers energy
4
Unit of force
6
Biological catalyst
8
Magnetic metallic element
11
Positive particle in nucleus
12
Center of an atom or cell
Down
2
The Red Planet
3
Blocking of light by a celestial body
5
Absolute temperature scale unit
7
Ball of burning gas in space
9
Our home planet
10
Gas essential for breathing