... 26.01.1999 . ... Credit: AURA / NOAO Explanation: The Omega Nebula contains glowing gas, dark dust , and some unusually massive stars . Also known as the M17 and the Swan Nebula , the Omega Nebula is about 5000 light-years away, 20 light-years across, and visible with binoculars in the constellation of Sagittarius . ... 1999 2000 . ... Publications with keywords: emission nebula - M17 - Omega nebula . Publications with words: emission nebula - M17 - Omega nebula . ... Emission Nebula IC 1396 . ...

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• NGC 6888: The Crescent Nebula
• XWare > APOD

... 2015 June 11 . The Light, the Dark, and the Dusty . ... Explanation: This colorful skyscape spans about three full moons (1.5 degrees) across nebula rich starfields along the plane of our Milky Way Galaxy in the royal northern constellation Cepheus . Near the edge of the region's massive molecular cloud some 2,400 light-years away, bright reddish emission region Sharpless (Sh) 155 lies at the upper left, also known as the Cave Nebula . ... About APOD | ... A service of: ASD at NASA / GSFC . ...

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• APOD: January 26, 1999 - M17: The Omega Nebula
• APOD: 2012 August 16 - NGC 6888: The Crescent Nebula
• APOD: 2009 September 15 - NGC 6888: The Crescent Nebula

EMBARGOED UNTIL: 9:00 A.M. (EDT) June 10, 1999 PHOTO NO.: ... Credit: M. Heydari-Malayeri (Paris Observatory ) and NASA/ESA NOTE TO EDITORS: Image files are available on the Internet at: http :// oposite.stsci.edu / pubinfo /pr/ 1999 /23 or via links in: http :// oposite.stsci.edu / pubinfo /latest.html http :// oposite.stsci.edu / pubinfo /pictures.html Higher resolution digital versions (300 dpi JPEG and TIFF) of the release images are available at: http :// oposite.stsci.edu / ...

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• Hubble Uncovers Dust Disk Around a Massive Black Hole (STScI-PRC98-22) A
• Arcetri Star-Formation Group Publications
• APOD: 2000 April 24 - Reflection Nebula M78

Star formation is often best manifested by bright H II regions.These are regions of hydrogen which have been ionized by ultraviolet photons which are emitted from massive stars (typically stars more than 20 times the mass of the Sun). ... A narrowband filter image centered on this wavelength will then readily reveal these H II regions and hence the current sites of star formation in a galaxy, The luminous blobs that can be seen here are all H II regions . ... NGC 3558 Visual . NGC 3558 Infrared . ...

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• Low Surface Brightness Galaxy Gallery
• Astronomy HyperText Book: Interstellar Medium
• Cosmological Issues for Theorists

... STScI-PRC95-45a CRUCIBLE OF CREATION: PANORAMIC HUBBLE MOSAIC ZOOMS IN ON MAELSTROM OF STAR BIRTH This spectacular color panorama of the center the Orion nebula is one of the largest pictures ever assembled from individual images taken with NASA's Hubble Space Telescope. ... Though this 2.5 light-years wide view is still a small portion of the entire nebula, it includes almost all of the light from the bright glowing clouds of gas and a star cluster associated with the nebula. ...

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• What is HISA?
• The Tarantula Nebula
• The Pleiades

... fran?ais . ... The cloud of pale gas surrounds a huge Red Giant star that has five times the mass of our Sun! ... The nebula was named by two British astronomers. ... Although the star at the heart of the nebula is millions of years younger than our Sun, it's already in a much later stage of its life. ... Our Sun is 4.6 billion years old and it's only just hitting middle age, whereas this star will live to be just a few million years old because it has much more mass. ...

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• The Very Large Telescope Project
• The Brightness of the Night Sky
• VISTA Reveals the Secret of the Unicorn | ESO

home publications > mercury . ... Big Clusters, Tiny Galaxies . ... Astronomers struggle to understand why giant star clusters form in the tiniest of galaxies . ... These clusters are probably young versions of globular clusters, but they are commonly called super star clusters. Seven dwarf galaxies within 16 million light-years have formed super star clusters, with one of these galaxies, NGC 1569, possessing two young clusters. ... Super star clusters have a lot to tell us about star formation. ...

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• ASP: Bright-Lights, Big-City, Overcast Survival Guide
• ASP: By the Light of the Moon
• ASP: Accidental Astrophysics: The Devil's In the Magnitudes, Part II

... ATNF Home . ... Parkes radio telescope . ... The most reliable way to estimate the rate of mass loss from massive stars is to observe the thermal radio continuum emission from their hot stellar winds. A program using the Australia Telescope Compact Array has detected such emission from 11 massive stars, almost doubling the number of these stars known at radio wavelengths. ... Radio continuum emission from massive stars: C. Leitherer (STScI); J. M. Chapman (AAO/ATNF) ; B. Koribalski (ATNF) . ...

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• ATNF Science Highlights
• ATNF Science Highlights 2004
• ATNF Colloquium

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Armagh Observatory, 30 July 2015: The sky above a nearby "failed star" or brown dwarf lying in the summer constellation Lyra shimmers with a beautiful green and yellow aurora ten thousand times brighter than the northern lights. ... Even a few years ago, brown dwarfs were thought by most astronomers to be incapable of emitting any significant radio emission, so its first detection came as a great surprise. ...

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• M. de Groot, Senior Research Associate
• Refereed Journal Publications 1999
• Jorick Vink

... Bad Astronomy . Misconceptions . ... Bad Astronomy : "We're light years more advanced than our competition!" ... Even the closest astronomical object, the Moon, is 400,000 kilometers away! ... A beam of light will travel 9,500,000,000,000 kilometers in one year. This distance is defined as a light year ; the distance light travels in a year. ... This is another example of Bad Astronomy; like a light year, a parsec is a unit of distance, not time (to be specific, it equals 3.26 light years) . ...

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• Phil Plait's Bad Astronomy: Bitesize Astronomy
• Phil Plait's Bad Astronomy: Q and BA

... The Galactic low-mass X-ray binary GS 2023+338 was discovered during the burst on May 22, 1989 with the Japanise satellite Ginga (aka Galaxy). The flux reached 17 crabs (this unit of flux measurement is an bright X-ray source, Crab Nebula) at 10-35 keV. ... No other radio telescope worldwide carried out multi-frequency measurements. ... Upon 14 days the radio flux fell below the detection level at the RATAN-600 in relation to the decrease of the X-ray flux. ...

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• Galaxy sector, archive 2004
• Metagalaxy sector, archive 1997
• Galaxy sector, archive 2014

... Tonight's Sky . ... Behemoth black hole found in an unlikely place . ... Ancient super-bright quasar with massive black hole found . ... Quasars supermassive black holes found at the center of distant massive galaxies are the most luminous beacons in the sky. ... An international team of astronomers, including Carnegie s Yuri Beletsky, has discovered the brightest quasar ever found in the early universe, which is powered by the most massive black hole observed for an object from that time. ...

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• If all photons have the same speed (the speed of light) and the same mass

... Phase light curves of binary model that consists of a primary component with mass M 1 and a secondary component with mass M 2 . ... The input parameters of the problem are the accretion rate onto the binary components ( ), the component mass ratio q = M 2 /M 1 , the orbital inclination to the line of sight , the eccentricity e, the rotation angle of the apsidal line relative to the observer , and the parameter c characterizing viscosity. ...

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• Conferences

... HUBBLE UNCOVERS DUST DISK AROUND A MASSIVE BLACK HOLE . Resembling a gigantic hubcap in space, a 3,700 light-year-diameter dust disk encircles a 300 million solar-mass black hole in the center of the elliptical galaxy NGC 7052. ... Because the jets in NGC 7052 are not perpendicular to the disk, it may indicate that the black hole and the dust disk in NGC 7052 do not have a common origin. ... NGC 7052 is located in the constellation of Vulpecula, 191 million light-years from Earth. ...

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• Herschel Detects a Massive Dust Reservoir in Supernova 1987A
• Roelof's Publications
• John H. Debes

... Our Sun is part of a huge wheel-shaped collection of stars. ... Astronomers have long suspected it was a very massive black hole, and that every galaxy had such a central mass, created early in the history of the universe. ... However, unless that object happens to be headed directly at the black hole (a relatively small target) it will just swing around and fly away again, like a comet making a pass at the Sun. The velocity acquired in falling towards the black hole also helps it escape. ...

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• (S-6) Seeing the Sun in a New Light

... GSAOI Home . ... Science . ... Deep imaging at J , H , and K is required to identify all stellar objects, brown dwarfs, and planetary mass objects in the central region of the Orion Nebula Cluster down to masses comparable to that of Jupiter. This is required to establish the initial mass function, i.e., the number of stars of each mass that have formed, in this region of intense massive star formation. ... The fields of the GSAOI detectors are shown as four green squares in each frame. ...

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• Julie Banfield | Astronomer
• IAU Commission #34 (Interstellar Matter)
• GSAOI Magellanic Cloud Planetary Nebulae Science Page

... Abubekerov M.K., Lipunov V.M. "The Lower Temperature Limits Of Accretors" Astronomy Reports, 2003, Vol. 47, Issue 8, pp.679-684. ... Abubekerov M.K., Antokhina E.A., Cherepashchuk A.M. "The Masses of X-ray Pulsars in Binary systems with OB Supergiants" Astronomy Reports, 2004, Vol. ... Abubekerov M.K., Antokhina E.A., Cherepashchuk A.M., Shimanskii V.V. "The Mass of the Compact Object in the Low-Mass X-ray Binary 2S 0921-630" Astronomy Reports Astronomy Reports, 2006, Vol.50, Issue 7, pp.544-552. ...

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Astronotes Armagh Planetarium's Stellar Blog! ... Armagh Planetarium . ... Stars . ... Space Flight . ... This image of the Tarantula Nebula comprises one of the largest mosaics ever assembled from Hubble photos and includes observations taken by HubbleтАЩs Wide Field Camera 3 and Advanced Camera for Surveys, combined with observations from the European Southern ObservatoryтАЩs MPG/ESO 2.2-metre telescope which trace the location of glowing hydrogen and oxygen. ... Subscribe to Astronotes . ...

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• Astronotes | Armagh Planetarium's astronomy news from across the Universe -
• Did a Wandering Star Light Up Ancient Skies? | Astronotes
• Cepheids Inconstant Stars which break the rules | Astronotes

Class 1 Introduction, Background History of Modern Astronomy The Night Sky, Eclipses and the Seasons Kepler's Laws Newtonian Gravity General Relativity Matter and Light Telescopes Class 2 Solar System Characteristics Formation Exosolar Planets Class 3 Stars The Sun Stellar Evolution of Low and High Mass Stars Deaths of Stars Exotic Stars Class 4 Galaxies Galaxy Classification Formation of Galaxies Galactic Evolution ... So far, one planet has been studied by this method. ...

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• http://www.aaa.org/s932/images/09fallclass3.pdf

... There are preliminary series of photometric and radio spectral observations of the above-mentioned stars, archival data on the light curves of the stars, results of the search for OH and H 2 O maser emission in IRAS point sources that possess the IR parameters similar to Miras. ... The aim is a detailed study of the maser emission variability. ... In 1996-1997, astronomical observations of Mira Ceti-type stars (miras) were carried out in three spectral ranges: optical, infrared, and radio. ...

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