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Posts tagged nebulas

Apr 15 '13
Mar 30 '13
Oct 25 '11
‘What powers the Heart Nebula? The large emission nebula dubbed IC 1805 looks, in whole, like a human heart. The nebula glows brightly in red light emitted by its most prominent element: hydrogen. The red glow and the larger shape are all created by a small group of stars near the nebula’s center. A close up in high dynamic range (HDR) spanning about 30 light years contains many of these stars is shown above. This open cluster of stars contains a few bright stars nearly 50 times the mass of our Sun, many dim stars only a fraction of the mass of our Sun, and an absent microquasar that was expelled millions of years ago. The Heart Nebula is located about 7,500 light years away toward the constellation of Cassiopeia.’
(via APOD: 2011 October 25 - IC 1805: The Heart Nebula in HDR)

What powers the Heart Nebula? The large emission nebula dubbed IC 1805 looks, in whole, like a human heart. The nebula glows brightly in red light emitted by its most prominent element: hydrogen. The red glow and the larger shape are all created by a small group of stars near the nebula’s center. A close up in high dynamic range (HDR) spanning about 30 light years contains many of these stars is shown above. This open cluster of stars contains a few bright stars nearly 50 times the mass of our Sun, many dim stars only a fraction of the mass of our Sun, and an absent microquasar that was expelled millions of years ago. The Heart Nebula is located about 7,500 light years away toward the constellation of Cassiopeia.’

(via APOD: 2011 October 25 - IC 1805: The Heart Nebula in HDR)

Oct 24 '11
‘What created the Waterfall Nebula? No one knows. The structure seen in the region of NGC 1999 in the Great Orion Molecular Cloud complex is one of the more mysterious structures yet found on the sky. Designated HH-222, the elongated gaseous stream stretches about ten light years and emits an unusual array of colors. One hypothesis is that the gas filament results from the wind from a young star impacting a nearby molecular cloud. That would not explain, however, why the Waterfall and fainter streams all appear to converge on a bright but unusual non thermal radio source located toward the upper left of the curving structure. Another hypothesis is that the unusual radio source originates from a binary system containing a hot white dwarf, neutron star, or black hole, and that the Waterfall is just a jet from this energetic system. Such systems, though, are typically strong X-rays emitters, and no X-rays have been detected. For now, this case remains unsolved. Perhaps well-chosen future observations and clever deductive reasoning will unlock the true origin of this enigmatic wisp in the future.’
(via APOD: 2011 October 24 - HH 222: The Waterfall Nebula)

What created the Waterfall Nebula? No one knows. The structure seen in the region of NGC 1999 in the Great Orion Molecular Cloud complex is one of the more mysterious structures yet found on the sky. Designated HH-222, the elongated gaseous stream stretches about ten light years and emits an unusual array of colors. One hypothesis is that the gas filament results from the wind from a young star impacting a nearby molecular cloud. That would not explain, however, why the Waterfall and fainter streams all appear to converge on a bright but unusual non thermal radio source located toward the upper left of the curving structure. Another hypothesis is that the unusual radio source originates from a binary system containing a hot white dwarfneutron star, or black hole, and that the Waterfall is just a jet from this energetic system. Such systems, though, are typically strong X-rays emitters, and no X-rays have been detected. For now, this case remains unsolved. Perhaps well-chosen future observations and clever deductive reasoning will unlock the true origin of this enigmatic wisp in the future.’

(via APOD: 2011 October 24 - HH 222: The Waterfall Nebula)

Oct 11 '11
‘It’s the bubble versus the cloud. NGC 7635, the Bubble Nebula, is being pushed out by the stellar wind of massive central star BD+602522. Next door, though, lives a giant molecular cloud, visible to the right. At this place in space, an irresistible force meets an immovable object in an interesting way. The cloud is able to contain the expansion of the bubble gas, but gets blasted by the hot radiation from the bubble's central star. The radiation heats up dense regions of themolecular cloud causing it to glow. The Bubble Nebula, pictured above in scientifically mapped colors to bring up contrast, is about 10 light-years across and part of a much larger complex of stars and shells. The Bubble Nebula can be seen with a small telescope towards the constellationof the Queen of Aethiopia (Cassiopeia).’
(via APOD: 2011 October 11 - NGC 7635: The Bubble Nebula)

It’s the bubble versus the cloud. NGC 7635, the Bubble Nebula, is being pushed out by the stellar wind of massive central star BD+602522. Next door, though, lives a giant molecular cloud, visible to the right. At this place in space, an irresistible force meets an immovable object in an interesting way. The cloud is able to contain the expansion of the bubble gas, but gets blasted by the hot radiation from the bubble's central star. The radiation heats up dense regions of themolecular cloud causing it to glow. The Bubble Nebulapictured above in scientifically mapped colors to bring up contrast, is about 10 light-years across and part of a much larger complex of stars and shells. The Bubble Nebula can be seen with a small telescope towards the constellationof the Queen of Aethiopia (Cassiopeia).’

(via APOD: 2011 October 11 - NGC 7635: The Bubble Nebula)

Sep 18 '11
weareallstarstuff:

Orion Nebula

weareallstarstuff:

Orion Nebula

Aug 25 '11
‘Look through the cosmic cloud cataloged as NGC 281 and it’s almost easy to miss stars of open cluster IC 1590. But, formed within the nebula, that cluster’s young, massive stars ultimately power the pervasive nebular glow. The eye-catching shapes looming in this portrait of NGC 281 are sculpted columns and dense dust globules seen in silhouette, eroded by intense, energetic winds and radiation from the hot cluster stars. If they survive long enough, the dusty structures could also be sites of future star formation. Playfully called the Pacman Nebula because of its overall shape, NGC 281 is about 10,000 light-years away in the constellation Cassiopeia. This composite image was made through narrow-band filters, but combines emission from the nebula’s hydrogen, sulfur, and oxygen atoms in a visible spectrum palette. It spans over 80 light-years at the estimated distance of NGC 281.’
(via APOD: 2011 August 25 - Portrait of NGC 281)

Look through the cosmic cloud cataloged as NGC 281 and it’s almost easy to miss stars of open cluster IC 1590. But, formed within the nebula, that cluster’s young, massive stars ultimately power the pervasive nebular glow. The eye-catching shapes looming in this portrait of NGC 281 are sculpted columns and dense dust globules seen in silhouette, eroded by intense, energetic winds and radiation from the hot cluster stars. If they survive long enough, the dusty structures could also be sites of future star formation. Playfully called the Pacman Nebula because of its overall shape, NGC 281 is about 10,000 light-years away in the constellation Cassiopeia. This composite image was made through narrow-band filters, but combines emission from the nebula’s hydrogen, sulfur, and oxygen atoms in a visible spectrum palette. It spans over 80 light-years at the estimated distance of NGC 281.’

(via APOD: 2011 August 25 - Portrait of NGC 281)

Aug 21 '11
psychedelicmandala:

Shapley 1: An Annular Planetary Nebula Image Credit: ESO
Explanation: What happens when a star runs out of nuclear fuel? For stars about the mass of our Sun, the center condenses into a white dwarf while the outer atmospheric layers are expelled into space and appear as a planetary nebula. This particular planetary nebula, pictured above and designated Shapley 1 after the famous astronomer Harlow Shapley, has a very apparent annular ring like structure. Although some of these nebulas appear like planets on the sky (hence their name), they actually surround stars far outside our Solar System.

psychedelicmandala:

Shapley 1: An Annular Planetary Nebula 
Image Credit: ESO

Explanation: What happens when a star runs out of nuclear fuel? For stars about the mass of our Sun, the center condenses into a white dwarf while the outer atmospheric layers are expelled into space and appear as a planetary nebula. This particular planetary nebula, pictured above and designated Shapley 1 after the famous astronomer Harlow Shapley, has a very apparent annular ring like structure. Although some of these nebulas appear like planets on the sky (hence their name), they actually surround stars far outside our Solar System.

(Source: apod.nasa.gov)

Aug 20 '11
stars, some are our origin …

stars, some are our origin …

(Source: fafafani)

Aug 20 '11
cosmic art.

cosmic art.

(Source: breetty)

Aug 16 '11
(via HubbleSite - NewsCenter - Hubble Offers a Dazzling View of the ‘Necklace’ Nebula (08/11/2011) - Release Images)
‘AUGUST 11, 2011: A giant cosmic necklace glows brightly in this NASA Hubble Space Telescope image. The object, aptly named the Necklace Nebula, is a recently discovered planetary nebula, the glowing remains of an ordinary, Sun-like star. The nebula consists of a bright ring, measuring 12 trillion miles across, dotted with dense, bright knots of gas that resemble diamonds in a necklace. The knots glow brightly due to absorption of ultraviolet light from the central stars.

The Necklace Nebula is located 15,000 light-years away in the constellation Sagitta (the Arrow). In this composite image, taken on July 2, 2011, Hubble’s Wide Field Camera 3 captured the glow of hydrogen (blue), oxygen (green), and nitrogen (red).’

(via HubbleSite - NewsCenter - Hubble Offers a Dazzling View of the ‘Necklace’ Nebula (08/11/2011) - Release Images)

AUGUST 11, 2011: A giant cosmic necklace glows brightly in this NASA Hubble Space Telescope image. The object, aptly named the Necklace Nebula, is a recently discovered planetary nebula, the glowing remains of an ordinary, Sun-like star. The nebula consists of a bright ring, measuring 12 trillion miles across, dotted with dense, bright knots of gas that resemble diamonds in a necklace. The knots glow brightly due to absorption of ultraviolet light from the central stars.

The Necklace Nebula is located 15,000 light-years away in the constellation Sagitta (the Arrow). In this composite image, taken on July 2, 2011, Hubble’s Wide Field Camera 3 captured the glow of hydrogen (blue), oxygen (green), and nitrogen (red).’

Aug 15 '11
(via Hubble Heritage)
‘

A Cosmic Necklace Larger than a Solar System
The “Necklace Nebula,” also called PN G054.2-03.4, is the exploded aftermath of a giant star that came too close to its Sun-like binary companion. The two stars that produced the Necklace Nebula live in a relatively small orbit about each other. They have a period of 1.2 days and a separation on the order of 5 times the radius of the Sun.
Evidence for the existence of the two-body system arises from the nebula’s appearance of a half-light-year-wide equatorial ring of dense material near the inner portion of the nebula. The expanding elliptical ring is composed of bright, dense knots of glowing hydrogen and oxygen gas. Each knot also dons a small tail pointing away from the central star. The clumpy appearance of the ring may have been caused by density fluctuations in the shared material of the binary stars prior to the explosion, or possibly by magnetic field lines present in the giant star as it began to expand and shed off its outer layers.
A fast, collimated outflow of nitrogen gas from the binary system has formed faint lobes and polar caps extending in the direction perpendicular to the ring. Edge to edge, the nebula is nearly 9 light-years long, over twice the distance between our Sun and our nearest stellar companion, Proxima Centauri.
Astronomers studying PN G054.2-03.4 predict that the outer lobes of gas were ejected about 10,000 years ago, before the two stars began sharing material. The inner ring of material was created only about 5,000 years ago (and relatively recent on astronomical timescales), and shares the same plane as the orbit of the two stars.
The Necklace Nebula is located about 15,000 light-years away in the northern constellation Sagitta. It was recently discovered in 2005 from the Isaac Newton Telescope Photometric H-alpha Survey (IPHAS), a ground-based H-alpha planetary nebula study of the North Galactic Plane.
The Wide Field Camera 3 (WFC3) detector onboard Hubble was used to observe the Necklace Nebula on July 2, 2011. Hubble’s WFC3 broadband filters, which show the colors of the galactic field stars, were used along with narrowband filters that show emission from the gases that make up the planetary nebula. In this composite image, ionized hydrogen gas is shown in blue, oxygen gas in green, and nitrogen gas in red. The field stars appear mainly white, with a reddish tint, which is indicative of the older population stars that make up the disk of our Milky Way galaxy.
Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)’

(via Hubble Heritage)

A Cosmic Necklace Larger than a Solar System

The “Necklace Nebula,” also called PN G054.2-03.4, is the exploded aftermath of a giant star that came too close to its Sun-like binary companion. The two stars that produced the Necklace Nebula live in a relatively small orbit about each other. They have a period of 1.2 days and a separation on the order of 5 times the radius of the Sun.

Evidence for the existence of the two-body system arises from the nebula’s appearance of a half-light-year-wide equatorial ring of dense material near the inner portion of the nebula. The expanding elliptical ring is composed of bright, dense knots of glowing hydrogen and oxygen gas. Each knot also dons a small tail pointing away from the central star. The clumpy appearance of the ring may have been caused by density fluctuations in the shared material of the binary stars prior to the explosion, or possibly by magnetic field lines present in the giant star as it began to expand and shed off its outer layers.

A fast, collimated outflow of nitrogen gas from the binary system has formed faint lobes and polar caps extending in the direction perpendicular to the ring. Edge to edge, the nebula is nearly 9 light-years long, over twice the distance between our Sun and our nearest stellar companion, Proxima Centauri.

Astronomers studying PN G054.2-03.4 predict that the outer lobes of gas were ejected about 10,000 years ago, before the two stars began sharing material. The inner ring of material was created only about 5,000 years ago (and relatively recent on astronomical timescales), and shares the same plane as the orbit of the two stars.

The Necklace Nebula is located about 15,000 light-years away in the northern constellation Sagitta. It was recently discovered in 2005 from the Isaac Newton Telescope Photometric H-alpha Survey (IPHAS), a ground-based H-alpha planetary nebula study of the North Galactic Plane.

The Wide Field Camera 3 (WFC3) detector onboard Hubble was used to observe the Necklace Nebula on July 2, 2011. Hubble’s WFC3 broadband filters, which show the colors of the galactic field stars, were used along with narrowband filters that show emission from the gases that make up the planetary nebula. In this composite image, ionized hydrogen gas is shown in blue, oxygen gas in green, and nitrogen gas in red. The field stars appear mainly white, with a reddish tint, which is indicative of the older population stars that make up the disk of our Milky Way galaxy.

Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)’

Aug 13 '11
spinning

spinning

Aug 7 '11

APOD: 2011 August 7 - MyCn18: An Hourglass Planetary Nebula

Media_httpapodnasagov_dpyzf

The sands of time are running out for the central star of this hourglass-shaped planetary nebula. With its nuclear fuel exhausted, this brief, spectacular, closing phase of a Sun-like star’s life occurs as its outer layers are ejected - its core becoming a cooling, fading white dwarf. In 1995, astronomers used the Hubble Space Telescope (HST) to make a series of images of planetary nebulae, including the one above. Here, delicate rings of colorful glowing gas (nitrogen-red, hydrogen-green, and oxygen-blue) outline the tenuous walls of the hourglass. The unprecedented sharpness of the HST images has revealed surprising details of the nebula ejection process that are helping to resolve the outstanding mysteries of the complex shapes and symmetries of planetary nebulas.