But what is a nebula in the first place? Have you ever wondered where nebulae come from, or what they're made of? If so, ...

The dark nebula is part of the Circinus West molecular cloud, which stretches for 180 light-years, containing a mass 250,000 times that of the sun.

Nebula are giant clouds of interstellar gas that play a key role in the life-cycle of stars. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

The Cat’s Eye is a young planetary, at perhaps 1,000 years. In part because of this, it shows the multiple stages of a ...

This image highlights two giant stars, WR 25 and Tr16-244, in the Trumpler 16 cluster, nestled inside the Carina Nebula — a glowing cloud of gas and stars about 7,500 light-years away in the Carina ...

Nebulae alone, for example ... which produces what astronomers call “tidal tails”—or tails literally made of stars. “It looks like mice because you have these two blobs and both have ...

The Veil Nebula is roughly 2,400 light-years away in the constellation Cygnus. It is the remnants of a star that was roughly 20 times as big as our sun and exploded about 10,000 years ago.

Other images show the vivid colors of nebulae, like the crimson red of the ... four pairs of the smoothest and cleanest mirrors ever made, according to NASA. The mirrors focus incoming X-rays ...