Nebulas are fabulous Crossword

The layer of gases commonly known as air
An expert in or student of astronomy
A French astronomer most notable for publishing an astronomical catalog
A group of stars forming a recognizable pattern
Develop gradually especially from a simple to a more complex form
A reaction in which two are more atomic nuclei
A gravitational bound system of stars, stellar remnants, interstellar gas, dusk, and dark matter
A space telescope that was launched into low earth orbit in 1990
An accumulation of gas, plasma, and dust in our others galaxies
A cloud of gas and dust in outer space
The chemical element of atomic number 7
A prominent constellation located on the celestial equator and visible throughout the world
A relatively loose grouping of stars
A star that suddenly increases greatly in brightness
Astronomical object consisting of a luminous spheroid of plasma held together by it’s own gravity