Across
1
Element found in all living things
4
Blocking of light by a celestial body
5
Fourth state of matter
6
Ball of burning gas in space
10
Form of thermal energy
Down
1
Icy body with a tail near the sun
2
Curved glass that refracts light
3
Path of a planet around the sun
7
Magnetic metallic element
8
Gas essential for breathing
9
Smallest unit of an element