... Tonight's Sky . ... The Magazine . News . Observing . ... Magazine . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Lowell Observatory . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ... Astronomy Magazine . ...

... Recently a new comet, designated 1998 H1, was discovered by observer Patrick L. Occultations and Rising Moons . ... This dramatic telephoto picture was taken at one such location, Ascension Island in the South Atlantic. Callisto Enhanced . ... Callisto is half rock and half ice. This moon of Jupiter is approximately the size of the planet Mercury, making it the third largest moon in the Solar System, after Ganymede and Titan. Callisto.. ... Did a gamma-ray burst precede this supernova? ...

3rd of March 2015 . 2015 ATNF Observing Schedules . The ATNF observing schedules for the 2015 April semester are now available on-line. All ATNF observations are carried out by the observers from the Science Operations Center (SOC), located at the ATNF Headquarters in Sydney, unless permission to observe remotely has been granted (generally to experienced observers who have recently observed from the SOC). ... today * ATNF | ... ATCA | ...

... In these pages we have collected contributions by fellow amateurs supernovae hunters. These contributions concern mainly the discoveries they made and their searching activity. ... External link) . The discovery of SN1997bp in NGC 4680 (from TA Magazine, vol34, n.397) - text and images. Visual Supernova Searching With The 40 inch Telescope at Siding Spring Observatory . ... A web page on SN1995G in NGC 1643 (external link to the South Australia Astronomical Society) - text and images. ...

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Mosiac of photos of Mercury taken from Mariner 10 in 1974 110k gif ; 2000k gif ; 187k jpg . ... recently reprocessed mosaic 132k gif ( caption ) . Mariner 10 mosaic 488k gif . another Mariner 10 mosaic 690k gif . another mosaic 24k jpg . ... Caloris Basin 319k gif ; 238k jpg ; 292k gif ; 3000k gif ; 108k jpg . ... Southwest Mercury 31k jpg ; 1000k gif ; 488k gif . Hills of Mercury 127k jpg ; 185k gif ; 614k gif . ... Degas, a rayed crater (Mariner 10) 439k gif ( caption ) . ...

... Click on an object in the solar system or choose from the list at left to learn more . The Arecibo Observatory planetary radar is the world's most powerful instrument for post-discovery characterization and orbital refinement of near-Earth objects. ... The Solar System Studies group is a department of the Arecibo Observatory, which is an NSF facility operated under cooperative agreement by SRI International, Universities Space Research Association (USRA), and la Universidad Metropolitana (UMET). ...

This page is devoted to information on Supernova 1999gi in NGC 3184 . ... Information on the original web pages for many of these images can be found on the Supernova links web page. ... NGC 3184 is a fairly close Mag 10.3 galaxy, only about half as distant as the Virgo cluster. ... Seiichi Yoshida has a 1999gi page . Odd Trondal's 1999gi page . ... CfA image . ... 14.5 . ... Jean Marie Llapasset image . ... vsnet-alert 3805 ] SN 1999gi in NGC 3184 . vsnet-chat 2438 ] Host galaxy of SN1999gi . ...