A planetary nebula (PN, plural PNe) is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives. The term "planetary nebula" is a misnomer because they are unrelated to planets. The term originates from the planet-like round shape of these nebulae … See more Discovery 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 … See more After a star passes through the asymptotic giant branch (AGB) phase, the short planetary nebula phase of stellar evolution begins as gases blow away from the central star at … See more Physical characteristics A typical planetary nebula is roughly one light year across, and consists of extremely rarefied gas, with a … See more The distances to planetary nebulae are generally poorly determined, but the Gaia mission is now measuring direct parallactic distances between … See more Stars greater than 8 solar masses (M⊙) will probably end their lives in dramatic supernovae explosions, while planetary nebulae seemingly … See more Planetary nebulae may play a very important role in galactic evolution. Newly born stars consist almost entirely of hydrogen and helium, but as stars evolve through the asymptotic giant branch phase, they create heavier elements via nuclear fusion which … See more Planetary nebulae have been detected as members in four Galactic globular clusters: Messier 15, Messier 22, NGC 6441 and Palomar 6. Evidence also points to the potential discovery of planetary nebulae in globular clusters in the galaxy M31. However, there is … See more WebA planetary nebula is the ejected shell of an evolved giant star. It is the shape of a spherical shell and is composed of relatively cool thing gas, which was once the outer part of the star. A planetary nebula is associated with the death …
Planetary Nebula ESA/Hubble ESA/Hubble
Web12 Dec 2013 · Planetary nebulae are astronomical objects made up primarily of gaseous materials. They are extended in size and fuzzy in appearance, and generally show some degree of symmetry. The nebula is illuminated by a central star, which sometimes is too faint to be seen. WebGas dissipation, planetary accretion in inner Solar System ends, and residual nebula gas is removed by T Tauri winds. T Tauri phase ends as internal temperature and pressure reach threshold for nuclear fusion. Gravitational contraction is now balanced by internal pressure and ceases. The beautiful aspect of this: asahidia
The solar nebula theory proposes that 1 a planets - Studocu
Web9 Apr 2024 · A nebula is a massive cloud composed mainly of hydrogen and helium gas along with dust. Nebulae can originate from the debris ejected by a dying star, like a supernova, or from areas where new stars are taking shape, earning the name "star nurseries." ... Dark Nebula, Planetary Nebula, and Supernova Remnant. One of these pre … Web29 Apr 2024 · The nebula itself is the beautifully illuminated shape made where the wind collides with that gas. A Supernova on the Face of a Spiral Galaxy (2024) ... Most shapes in space are round or blobby, but the planetary nebula HD 44179 is boxy, giving it the popular name the Red Rectangle. This 2004 Hubble image shows that the fundamental shape of … Web3 Dec 2024 · 8. There are several different types of nebulae: molecular clouds, also known as HII regions because they are mainly made up of hydrogen, supernova remnants, planetary nebulae and dark nebulae. 9. Nebulae themselves are not dangerous - they are just gas and dust - but the effects of a new star forming, or supernovas exploding, could be. 10. asahi desk fan