Nebular Theory Crossword

This printable crossword puzzle on the topic of Astronomy & Space has 11 clues. Answers range from 4 to 21 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

A giant cloud of dust and gas in space.
millions and billions of stars, with gas and dust, held together by gravity.
A rotating circumstellar disk of dense gas and dust.
A reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles.
A large body of matter in orbit around the sun or a star and thought to be developing into a planet.
A natural satellite.
A contracting mass of gas which represents an early stage in the formation of a star.
The circumstellar disc in the Solar System located roughly between the orbits of the planets Mars and Jupiter.
One body, whether it's a star, an asteroid or a comet, crashes into another body.
An explanation for the formation of solar systems.
An extended shell of icy objects that exist in the outermost reaches of the solar system.