Emission nebulae, often called H II regions, are clouds of ionized gas that emit their own light. The most famous example of an emission nebula is the Orion Nebula. These nebulae are often red in color because they are mainly composed of hydrogen gas, and the ionization process emits light in the red part of the spectrum.

2025年1月27日 · The Cave Nebula is an emission nebula located approximately 2,400 light-years away in the northern constellation Cepheus. With an apparent magnitude of 7.7 and an… Read More » Cave Nebula (Caldwell 9)

An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths. The most common source of ionization is high-energy ultraviolet photons emitted from a nearby hot star .

This is a diffusing subcategory of Category:Nebulae. Articles about emission nebulae in the parent category should be moved to this subcategory.

Below is the list of the 110 Messier objects (in the original order): The Crab Nebula (M1) is a supernova remnant approximately 6,500 light years away in the constellation Taurus. It is the remnant of the historic supernova SN 1054, observed from July 4, 1054, to April 6, 1056.

This is a list of diffuse nebulae. Most nebulae are diffuse, meaning that they do not have well-defined boundaries. Types of diffuse nebulae include emission nebulae and reflection nebulae.

The Sharpless catalog is a list of 313 emission nebulae and H II regions found in the northern hemisphere.

2021年11月1日 · Nebulae are some of the most resplendent objects in the universe, but it’s easy to confuse which one is an “emission nebula,” and which one is an “absorption nebula.” Thankfully, this “Field Guide” will give you a quick rundown so you can impress all of your friends with your Nebulae Knowledge!

An emission nebula (EN) is an ionized gas cloud that emits light of various wavelengths. The most common source of ionization are high-energy photons emitted from a nearby hot star. Planetary nebulae, HII regions, and Herbig-Haro objects are different types of emission nebulae.

These include emission nebulae that shine from being heated by close hot stars, reflection nebulae that glisten by scattering nearby starlight, and planetary nebulae – which are actually glowing shells of stellar material blown off aging stars.