... Credit: NASA Swift Team , Stefan Immler ( GSFC ) et al. ... But staring toward the northern constellation Bootes on March 19th, even without binoculars or telescope you still could have witnessed a faint, brief, flash of light from a gamma-ray burst . The source of that burst has been discovered to lie over halfway across the Universe at a distance of about 7.5 billion light-years. ... March . ... Publications with keywords: gamma-ray burst . Publications with words: gamma-ray burst . ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2008 March 28 . Across the Universe . Credit: NASA Swift Team , Stefan Immler ( GSFC ) et al. ... But staring toward the northern constellation Bootes on March 19th, even without binoculars or telescope you still could have witnessed a faint, brief, flash of light from a gamma-ray burst . ... About APOD | ...

home publications > mercury . SEARCH ASP SITE: Match ALL words Match ANY word . ... Publications of the ASP (PASP) . ... What Is a "Planet"? ... The Sun defined daytime and the stars provided a fixed background of twinkling lights at night. ... The Greeks included the Sun and Moon as planets, along with Mercury, Venus, Mars, Jupiter, and Saturn, because motion against the stars was their defining characteristic of "planet." Both the stars and planets were thought to revolve around Earth. ...

... Dark energy is believed to be a component of the Universe whose repulsive gravity is presently accelerating the expansion of the Universe.€а Although it comprises the bulk of the mass-energy of the Universe, its nature is not well understood.€а €аAlbert Einstein originally suggested its existence about 80 years ago. A supernova is the explosive death of a star, which unleashes a burst of light through the cosmos. ... This website is a gift from Nancy Riess . ...

... 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) . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Colin Johnston . ... Our Galaxy . ... To locate it, look along the imaginary line between the two end stars on the leading edge of the PloughтАЩs blade (Merak and Dubhe) and Polaris (the North Star), the galaxy M82 (also known as the Cigar Galaxy) along with its companion M81, lies just off this line about a third of the way between the Plough and Polaris. €а€аAs usual, the supernova is far brighter than its home galaxy, appearing as an extra star. ...

... Bringing news from across the Universe to children all around the world . ... Gamma-Ray Bursts are the brightest explosions in the Universe. ... We only see Gamma-Ray Bursts in very distant galaxies; galaxies so far away that it takes billions of years for their light to reach us. ... Astronomers think that Gamma-Ray Bursts are caused by the detonation of massive stars at the end of their lives. These blazing bursts of light are normally followed by a fainter afterglow. ...

This all-sky image, constructed from 2 years of observations by NASA's Fermi Gamma-ray Space Telescope, shows how the sky appears at energies greater than 1 billion electron volts (1 GeV). Brighter colors indicate brighter gamma-ray sources. ... A diffuse glow fills the sky and is brightest along the plane of our galaxy (middle). Discrete gamma-ray sources include pulsars and supernova remnants within our galaxy as well as distant galaxies powered by supermassive black holes. ...

ATNF Home . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Information & tools for observers . ... Australia Telescope Online Archive (ATOA) . ... ATCA | ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... The Australia Telescope National Facility Colloquium . ...

Supernova 2006aj (GRB 060218) in Anonymous . This page is devoted to information on Supernova 2006aj in an anonymous galaxy. ... Information on the original web pages for many of these images can be found on the updates and links web pages. Origially a gamma ray burst discovered by the Swift burst alert telescope . This supernova is the afterglow of gamma ray burst GRB 060218 . ... GCN 4775 Swift-BAT detection of a possible burst . GCN 4776 GRB 060218: Swift XRT Position . ...

... The explosion of a star as a Supernova is certainly one of the most energetic events observable in the whole universe, and their radiation covers the whole band from radio to gamma-rays, accompanied with neutrino emission. ... Type Ia SNe are supposed to result from mass transfer inside a binary system consisting of a white dwarf star and an evolving giant star, which results in a termonuclear explosion. ... Core-collapse Supernovae . ... For comments please contact: gcresci@arcetri.astro.it . ...

In this gallery are many images of Low Surface Brightness Galaxies which have recently been discovered and analyzed. ... The central surface brightness of this galaxy is 24.28 . Malin 2 This galaxy is another huge disk galaxy with a scale length of 15 kpc and a redshift of 15000 km/a. The high surface brightness knot in one of its spiral arms actually has the same color, luminosity and H-alpha equivalent width as the entire Large Magellanic Cloud . ... Truly it is a Low Surface Brightness Galaxy. ...

... 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. ...

Tired light models invoke a gradual energy loss by photons as they travel through the cosmos to produce the redshift-distance law. ... The tired light model can not produce a blackbody spectrum for the Cosmic Microwave Background without some incredible coincidences. ... So the CMB must have come from a far away part of the Universe, and its photons will thus lose energy by the tired light effect. ... Assume that the CMB starts out as a T = (1+z)*T_o = 2.998 K blackbody, which is the blue curve. ...

... X-rays are made up of photons that are emitted from stars, or quasars, or supernovae, the sun, or simply: anything that is undergoing a change either in size or temperature or giving out heat. ... in an X-ray binary star system, in which one normal star's orbit is crossed by a neutron star, when the neutron star by means of gravitational pull takes matter from the normal star X-rays form. ... Artists conception of a normal star (HDE 226868) and a black hole taking matter from the normal star. ...

... 1997: . For the most representative sample of 277 most nearby galaxies, their masses, separations and tidal indexes were determined based on the BTA observations. ... The most detailed light curve of optical star-like source (corresponding to the gamma-burst of May 8, 1997) was obtained from the BTA observations simultaneously in 4 photometric bands. ... An effect of an abrupt rate slowdown is noticeable in the infrared (~8000A) 36 days after the gamma-ray burst. ... Archive . ...

... This project is lead by Dr Brian Schmidt and aims to measure the ultimate fate of the Universe: Will the Universe expand forever, or will gravity eventually halt its expansion, and send it crashing into the "gnaB giB" the "Big Bang" in reverse? ... Measuring distances in the Universe is extremely difficult, but by comparing the relative brightnesses of SN Ia, it is possible to measure a distance to a single object with a precision of about 7%. ... SN 1997ck, the most distant star yet discovered . ...

... The cosmic gamma-ray bursts lasting more than 2 seconds (long GRBs, 2-100 sec) are now thought to be related to explosions of massive supernovae (SNe). ... The earliest spectra were obtained with the BTA of an optical transient (OT) related to the gamma-ray burst GRB 030329. ... An extended object (a blue host galaxy of gamma-ray burst with B=24.55, V=24.35, Rc=24.36, Ic=23.79) was detected which coincides with the position of an Optical transient (OT GRB) of this burst observed in October 2002. ...

... GCN 1488 . ... GCN 2001 , 2024 , 2046 , 2051 , 2054 , 2079 , 2094 , 2105 , 2108 , 2119 , 2198 , 2204 , 2220 , 2260 , 2299 , AstL (2003) , ApJ (2004) . ... GCN 2821 , 2826 , ApJ (2010) . ... GCN 3139 , ApJ (2010) . ... GCN 3493 , ApJ (2010) . ... GCN 3718 , ApJ (2010) . ... GCN 3853 , 3864 , 3896 , ApJ (2010) . ... GCN 5173 , 5177 , 5183 , 5186 , 5189 , 5193 , AstL (2007a) , AstL (2007b) , A (2010) . ... GCN 5524 , ApJ (2010) . ... GCN 9037 , ApJ (2010) . ... Russian-Turkish 1.5-m Telescope (RTT150) ...

... Gamma-ray bursts (GRBs) are the most powerful explosions in the universe. The explosions release most of their energy as gamma-rays, hence the name. ... Stan Woosley believes that bursts happen when a very massive star suddenly turns into a black hole. ... They calculate that a gamma-ray burst within 300 light years would have flooded the dusty disc circling the young Sun with enough energy to fuse up to 100 Earth masses of material into droplets that cooled into chondrules. ...