Planetary Nebulae
Planetary nebulae (PN) represent the last stages of evolution for low- and intermediate-mass stars whose Main Sequence mass was less than about 8 solar masses.
Planetary nebula
NGC 6543, the Cat's Eye Nebula
A planetary nebula is an astronomical object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their lives.
Planetary Nebulae
A bright, colorful shell of gas and dust surrounding a star in the last stages of life. A planetary nebula is created when the star puffs off its outer atmosphere.
Planetary Nebula
Related Category: Astronomy: General
see nebula.
More on Planetary Nebula
Nebula - are irregular in shape, and range up to 100 light-years in diameter.
Planetary nebulae, some of the loveliest objects in the sky, are complex shells of gas that have been ejected by dying advanced giant stars like Mira. They were discovered as a set and given their name by William Herschel in the late 1700s.
Planetary nebula
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A planetary nebula is an interstellar gas cloud created by the expelled matter of a star reaching then end of its life.
Planetary nebulae form when a star can no longer support itself by fusion reactions in its center.
Planetary Nebula
A nebula produced when a star expels its outer layers. Many planetary nebula are spherical, and appear to be nearly perfect circles to observers since the largest occurs for the portions of the sphere tangent to the line of sight.
Planetary nebula
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Planetary nebula are created from the shells of gas and dust thrown off by a dying star in the last stages of its life. They are commonly seen around stars that are up to the same size as our own Sun.
Planetary Nebula PK164+31°.1 in Lynx
This is a very large and very faint (12 mag.) planetary nebula. Two brighter lobes can be noticed in a 10 inch and larger scopes 2°30' NW of 27 Lyncis (see finder chart below).
Planetary Nebulae
In an AGB star, if the helium fuel in the He-burning shell runs low, the outward radiation pressure drops off.
planetary nebulae (in planetary nebula (astronomy): Chemical composition)
small bodies
(in small body (astronomy))
collision danger (in Earth impact hazard (astronomy)) ...
PLANETARY NEBULAE
Our aged stage 12 star is now in quite a predicament. Its inner carbon core no longer generates energy.
planetary nebula The ejected envelope of a red giant star, spread over a volume roughly the size of our solar system.
planetary ring system Material organized into thin, flat rings encircling a giant planet, such as Saturn.
planetary nebula
a glowing shell of gas ejected by a dying, low-mass star
planetary nebulae ...
Planetary nebulae. These can also trace the population II components, since they can be produced by old stars.
Planetary nebula An expanding shell of gas ejected from a star. Thought to be the outer layers of a red giant during its latter stages of evolution, the core of which becomes a white dwarf.
Planetary Nebula: What is the shape of the nebula? Can you see any colour? Is it stellar in appearance or can a disk be seen? Are the edges well defined or diffuse? Are there any brighter/darker areas? Can a central star be seen?
Planetary Nebula: The gaseous outer layers of a star that have been ejected into space as the star collapses into a white dwarf. The ultraviolet radiation from the white dwarf causes the gas to fluoresce.
PLANETARY NEBULA - Emission nebula formed when a red giant star blows off its outer envelope. A planetary nebula results when the ejected material is heated by strong UV radiation from the hot central star.
Planetary nebula- a shell of gas puffed off by a star late in its life; their often round appearance led to the name
Planitia- plateau or high plain ...
planetary nebula
A nebula which is formed by the expelled gases from a low mass star, being illuminated by the remnant white dwarf.
plate tectonics
The motions of the plates which make up the crust of the Earth.
planetary nebula
A shell of gas ejected from, and expanding about, a certain kind of extremely hot star.
Planetary Nebula
(a) A bubble of gas surrounding a hot, dying star. The star is so hot that it makes the planetary nebula glow, which allows astronomers to see it.
Planetary nebula. A shell of gas that surrounds a small, dense, hot star. The name is misleading because planetary nebulae have no connection with planets.
Planetary Nebula - A luminous shell surrounding a hot star. The gas in a planetary nebula was ejected from the star while it was a red giant ...
A protoplanetary nebula or preplanetary nebula is an astronomical object which is at the short-lived episode during a star's rapid stellar evolution between the late asymptotic giant branch phase and the subsequent planetary nebula phase....
Planetary nebula get their name because some looked like round, green planets in early telescopes. They are now known to be entirely different than the planets and are about one or more light years across (much larger than our solar system!).
Planetary nebulae, or planetaries, are so called because many of them superficially resemble planets through telescopes.
planetary nebula - Space and Astronomy Definition - Online Dictionary and G...
shock wave - Space and Astronomy Definition - Online Dictionary and Glossar...
Fast Fourier Transformation (FFT) - Space and Astronomy Definition - Online...
Planetary nebulae are made of small shells of gas thrown off by dying, low-mass stars. The Sun will produce a planetary nebula as it dies in about six billion years.
Planetary nebulae are nebulae that form from the gaseous shells that are ejected from low-mass asymptotic giant branch stars when they transform into white dwarfs.
Planetary nebula M 97
Galaxies: M 81, M 82 und M 101
Mulptiple Star System zeta UMa
Meteor Showers: Alpha Ursa-Majoriden, Ursiden, Leoniden-Ursiden ...
Planetary nebulae: NGC6778, NGC6741, NGC6772
NGC6804 looks like a small bright ring.
NGC6751 the "glowing eye" nebula.
Planetary Nebula
A very hot star surrounded by expanding gases that give off a glow because of intense radiation from the star.
Porridge ...
Planetary nebulae seem to mark the transition of a medium mass star from red giant to white dwarf. Stars that are comparable in mass to our Sun will become white dwarfs within 75,000 years of blowing their envelopes.
Planetary nebulae are created when a red giant star ejects its outer envelope, forming an expanding shell of gas. However it remains a mystery why these shells are not always spherically symmetrical.
PLANETARY NEBULA
A planetary is a nebula formed from by a shell of gas which was ejected from a certain kind of extremely hot star. As the giant star explodes, the core of the star is exposed. Planetary nebulae have nothing to do with planets.
planetary nebula - (n.)
A cloud of glowing, ionized gas, usually taking the form of a hollow sphere or shell, ejected by a star in the late stages of its evolution.
planetesimal - (n.) ...
Planetary Nebula
A shell of gas surrounding a small, white star. The gas is usually illuminated by the star, producing a variety of colors and shapes.
Planetary Nebula: At the end of the life of a lower mass star it is on the asymptotic giant branch as a huge red giant. The core is composed of carbon and oxygen; helium burning has ceased.
A planetary nebula about 140 pc distant in Aquarius with the largest known angular diameter of any planetary. (NGC 7293) [H76]
Helmholtz Contraction
See Kelvin-Helmholtz contraction. [H76]
Henry Draper system ...
The planetary nebula M2-9 (© Hubble Space Telescope.) Everything on Earth, with the exception of hydrogen and helium, was made in stars. The hydrogen and most of the helium in the universe were made when the universe was only a few minutes old.
Ant planetary nebula. (Image by NASA)
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Encyclopedia.com provides students and teachers facts, information, and biographies from verified, citable sources, including: ...
This planetary nebula is found in a rather isolated part of the sky, about six degrees east of psi Velorum, just inside the border with Antlia. The closest bright star is q Velorum (3.85m), two degrees to the southeast.
The first planetary nebula most people see can be easily found this week, looking like the middle "star" in the sword of Orion. This is M42, the famous Orion Nebula.
But what about the other type of cluster, the globular clusters?
Description: planetary nebula
Constellation: Ursa Major
Small Image
Large Image ...
The Cat's Eye Planetary Nebula
MEDIUM STARS
As a red giant, the hydrogen gas in the outer shell continues to burn as the temperature in the core continues to rise.
NGC 1360 is a planetary nebula that appears dim and elliptical in shape and has an unusually long axis.
NCG 1365 is another barred spiral galaxy. It has two clearly discernible arms and is one of the largest galaxies in the area.
Jacoby, G. H. "Planetary Nebulae as Standard Candles 1. Evolutionary Models." Astrophys. J. 339, 39-52, 1989.
Tonry, J. and Schneider, D. "A New Technique for Measuring Extragalactic Distances." Astron. J. 96, 807, 1988.
Hubble Images of Planetary Nebulae
Hubble Images of Novae
High Energy Archive Images
Stellar Death - Large Mass Stars ...
NGC 4361 This large planetary nebula is about 50" in diameter, and has an easily seen central star. The nebulosity is grey, and reminds me somewhat of the Owl Nebula in Ursa Major.
4 light-years (ly) away from our Sun, Sol, at the western part of (11:43:14.9-51:49:57, ICRS 2000.0) of Constellation Centaurus, the Centaur -- west of Delta and Rho Centauri and northwest of the Blue Planetary Nebula (NGC 3918) and Gacrux.
The star will now begin to shed its outer layers as a diffuse cloud called a planetary nebula.
The planetary nebula represents the final stage in the evolution of a star similar to our Sun. The star at the center was a red giant a few thousand years ago, but then ejected its outer layers into space to form the nebula.
NGC 6302, a planetary nebula
AAT 72. A dark cloud in Scorpius
AAT 104. NGC 6231, the Sco OB association
AAT 105. IC 4628, emission nebula in Scorpius
AAT 114. NGC 6242, an open cluster
AAT 121. M4, NGC 6121, globular cluster in Scorpius
UKS 4.
The planetary nebula, named the Saturn Nebula, is also in the Waterbearer.. It is so named because it looks like the planet Saturn when viewed through a telescope.
The Egg nebula (CRL2688) is a planetary nebula about 3,000 light-years from Earth. This huge cloud of dust and gas is expanding outwards at very high speeds.
This ultraviolet image shows a planetary nebula known as the Helix Nebula. It is the nearest example of what happens to a star, like the sun, as it approaches the end of its life. Image Credit: NASA Jet Propulsion Laboratory (NASA-JPL) ...
 See also: Planet, Nebula, Star, Sky, Telescope
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