Planetary nebula - Wikipedia
The first planetary nebula discovered (though not yet termed as such) was the Dumbbell Nebula in the constellation of Vulpecula. It was observed by Charles Messier on July 12, 1764 and …
Planetary nebula | Definition, Temperature, Size, & Facts | Britannica
Planetary nebula, any of a class of bright nebulae that are expanding shells of luminous gas expelled by dying stars. They have a relatively round compact appearance rather than the …
Planetary Nebulas - Harvard–Smithsonian Center for Astrophysics
When a star like our Sun dies, it doesn’t explode into a supernova or collapse into a black hole. Instead, it gently sheds its outer layers, which form a beautiful cloud called a “planetary …
Planetary nebula - Simple English Wikipedia, the free encyclopedia
A planetary nebula is a nebula that is made up of gas and plasma. They are made by certain types of stars later in their life. They look like planets through small optical telescopes. [1] . …
Planetary Nebula - ESA/Hubble
A planetary nebula is a region of cosmic gas and dust formed from the cast-off outer layers of a dying star. Despite their name, planetary nebulae have nothing to do with planets.
Planetary Nebulae - NASA
Webb Study Reveals Rocky Planets Can Form in Extreme Environments
Index - Nebulae: Planetary Nebulae - Astronomy Picture of the Day
They're all planetary nebulae of course, glowing gaseous shrouds shed by dying sun-like stars as they run out of nuclear fuel. Beautiful to look at, the symmetric, planet-like shapes of these …
Caldwell 15 - NASA Science
2024年8月23日 · It will appear low in the northern sky for Southern Hemisphere observers during the winter. Also known as NGC 6826, Caldwell 15 is about 2,200 light-years away from Earth. …
Planetary Nebulae and Their Central Stars - Nature
Planetary nebulae (PNe) are fascinating astronomical objects that represent a late stage in the evolution of low- to intermediate-mass stars. They are formed when these stars expel their …
Planetary nebulae - Scholarpedia
2013年12月12日 · Planetary nebulae are astronomical objects made up primarily of gaseous materials. They are extended in size and fuzzy in appearance, and generally show some …