Diffuse Nebulae are areas of the raw materials, dus and gas, from which stars are born. These Diffuse Nebulae are found along the spiral arms of the Milky Way, and are visible in other nearby galaxies as well.
In an Emission Nebula one or more hot stars causes the nebula to emit light of its own. They have a reddish glow.
A Reflection Nebula only reflects light from nearby stars and shows a blue colour.
Planetary Nebulae have nothing to do with planets, but their name arose from their disk-like appearance. They are almost spherical cast-off shells of gas from very hot stars, late in their life spans. Often the ionized gas has a greenish colour.
On this page the Nebulae are sorted by catalog number.
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