... August 11, 1995 . The Compton Gamma Ray Observatory . Credit: NASA , Compton Gamma Ray Observatory Science Support Center . Explanation: The Compton Gamma Ray Observatory (CGRO) was the most massive instrument ever launched by a NASA Space Shuttle and continues to revolutionize gamma-ray astronomy. This orbiting observatory sees the sky in gamma-ray photons - light so blue humans can't see it. ... Tomorrow's picture: Atlantis Landing . ...

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• APOD: 2000 April 8 - Compton Observatory In Orbit
• APOD: 2015 October 28 - Massive Black Hole Shreds Passing Star
• APOD Index - Space Technology: Orbiting Observatories

... This stunning image from the orbiting Chandra X-ray Observatory is centered on the Vela pulsar -- the collapsed stellar core within the Vela supernova remnant some 800 light-years distant. ... Active Regions, CMEs, and X Class Flares . ... Up Close to Jupiter's Moon Io . ... Above is the highest resolution photograph yet taken of the Solar System's strangest moon. The surface of Jupiter's moon Io is home to violent volcanoes that are so active they turn the entire moon inside out. ...

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... 2000 December 15 . IC443's Neutron Star . ... Explanation: Using x-ray data from the orbiting Chandra Observatory along with radio data from the Very Large Array , a team of researchers has discovered evidence for a new example of one of the most bizarre objects known to modern astrophysics -- a neutron star . ... The core collapsed when the star, located a reassuring 5,000 light-years away in the constellation Gemini , exploded long ago. How long ago? ... About APOD | ... NASA Technical Rep.: ...

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• APOD: 2000 July 13 - LP 944-20: A Failed Star Flares
• Jupiter's Moon Amalthea
• APOD: 2000 August 18 - X-Rays From Antennae Galaxies

... ATNF Colloquium . The Evolution of Massive Stars: Closing the Loop in the Galaxies of the Local Group . ... They are also the source of the most energetic phenomenon yet found, emitting gamma-ray bursts as they collapse into black holes. In early times they likely played a key role in the re-ionization of the Universe, and their remnants may have formed the seeds of super-massive black holes found in the centers of galaxies today. ... today * ATNF | ...

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• ASTRONOMERS FIND MOST MASSIVE COMPANION TO RADIO PULSAR
• UBV Photometry of the Massive Eclipsing Binary TT Aur

3) Planets and Brown Dwarfs . ... By its nature, this method is most sensitive to massive planets orbiting close to their stars. ... That means that some of the more massive extrasolar planets could actually be brown dwarfs (although the statistics of the finds suggest that most of them are not). ... Another possible difference between brown dwarfs and massive planets is how they are born. ... They would base the fundamental definition on the mode of formation: a planet is built from planetesimals. ...

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• ASP: Picture an Astronomer
• ASP: Astronomy Behind the Headlines

... GOODS unites extremely deep observations from NASA's Great Observatories, Spitzer , Hubble , and Chandra , ESA's Herschel and XMM-Newton , and from the most powerful ground-based facilities, to survey the distant universe to the faintest flux limits across the electromagnetic spectrum. ... The space-based observations are complemented by ground-based imaging and spectroscopy, including extensive commitments of ESO and NOAO observing time. ... 2010-04-10: Deep VLA 1.4 GHz data for GOODS-North . ...

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• HST this week: 113
• Herschel Detects a Massive Dust Reservoir in Supernova 1987A
• Full-Color Mosaic Pictures for CDF-S and HDF-N GOODS: The Great Observatories

Most of these images were obtained by Mike Bessell, Michelle Buxton, Hwankyung Sung, Ralph Sutherland and Bob Watson at SSO using a 2Kx2K Site CCD behind a Nikon or Hasselblad lens or directly on the 1m telescope. A few images are from the Hubble Space Telescope. Some of the M42 images were obtained with the KPNO 1m and ESO NTT telescope. One image is a mosaic of IRAS images. ... Details of the CCD imaging program at MSSSO. ... antenna.jpg (53KB) . ... ngc6744.jpg (59KB) . ...

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• Some Black Holes are Pink
• IAU Commission #34 (Interstellar Matter)
• GSAOI Gemini Pictures Page

... Tonight's Sky . ... Observing . ... Sky this Month . ... Observing Podcasts . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... Seasonal Observing . ... How massive must a colliding body be to disturb Earth's orbit? ... Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter...

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• XMM-Newton's massive discovery | Astronomy.com
• Spacecraft capture an Earth-directed coronal mass ejection | Astronomy.com
• Chandra Observatory searches for trigger of nearby supernova | Astronomy.com

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Three sixth-form students from St Patrick's Grammar School, Armagh , used the Faulkes Telescope South in Australia in April to observe and measure HW Virginis , an unusual "binary" or double star system suspected to host one or two extrasolar planets orbiting the central stellar pair. ... Armagh Observatory and associated researchers hope to develop this work to look for further evidence of planet-hosting binary star...

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• Observations with the Faulkes Telescopes
• Armagh Observatory Press Release
• Armagh Observatory Press Release Origin of Stars

... Planets . ... The planets were found using the HARPS instrument on the 3.6m telescope at ESOтАЩs La Silla Observatory. ... A planet in orbit around a star causes the star to regularly move towards and away from observers on Earth. ... One newly discovered planet, HD 85512 b, is best hope found so far for a habitable exoplanet. ... The HARPS team so far have found that about 40% of stars similar to own Sun have at least one planet smaller than Saturn (which is 95 times more massive than Earth). ...

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• Kepler-11: a strange and crowded planetary system | Astronotes
• Cepheids Inconstant Stars which break the rules | Astronotes
• Supernova spotted by Irish astronomer | Astronotes

... Solar System . Star Clusters . ... Stars@ESO . ... Observations with the Very Large Telescope Interferometer (VLTI) at the ESO Paranal Observatory (Chile) have provided the first-ever direct determination of the angular sizes of the disks of the solar-type stars Alpha Centauri A and Alpha Centauri B. As the two largest members of this triple stellar system that also includes the much smaller Proxima Centauri, they are the Sun's nearest neighbours in space at a distance of just over 4 light-years. ...

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• Exoplanet Caught on the Move | ESO
• ESO - star07
• Smoke Signals in Space | ESO

... Files in red?history) . ... The Sun . ... Large sunspots may be occasionally seen by the unaided eye, with the sun near the horizon and dimmed by thick haze. ... Year after yea