... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope 20GHz Survey . ... Star Formation at High Galactic Latitude: . A Case for Extensions to the Survey . ... The AAO/UKST Survey should be extended to high Galactic latitude ( ) to search for TTauri stars. The Survey can contribute to a complete inventory of young stellar objects in high-latitude clouds, which will help define the limits of conditions and processes that lead to star formation. ...

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... Tonight's Sky . ... The Magazine . News . Observing . ... Magazine . ... Star Atlas . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Open cluster NGC 2818, spiral galaxy NGC 2964, and spiral galaxy NGC 2976 . ... Astronomy for Kids . ... star formation . ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... The Russian TESIS/ CORONAS-PHOTON Solar Observatory, which has been working in orbit since January 30th, 2009, has photographed one of the most important events in the build up to the upcoming solar cycle - the formation of our star's new southern belt of activity. The first magnetic fields of the new cycle in the southern hemisphere appeared on the Sun's surface on May 23-24th. ... The belt of activity is one of the primary concepts, characterizing the solar cycle. ...

... Galaxy Evolution home . ... Regulating the ISM and star formation . Cosmological evolution of star-forming galaxies . The origin and evolution of radio sources . Radio sources and their environments . ... Observations of the local Universe clearly demonstrate that very active star formation phases (starbursts) are often associated with interacting and merging galaxies and that in these systems much of the short wavelength emission is absorbed by dust and re-emitted in the IR. ...

... The star formation rate (SFR) of the current SF episode can be estimated from the total H luminosity. ... For the derived total flux F (H )=5.8 erg s -1 cm -2 we obtain a total H luminosity of 10 39 erg s -1 . ... The total mass of ionized gas can be obtained from the average mass density inside the H II region and its volume. An average mass density corresponding to the average electron density of 1 cm -3 within a volume with a diameter of 0.5 kpc yields a total ionized gas mass of 10 6 . ...

... A model for the chemical evolution of a disk galaxy is presented. The model reproduces all the basic . ... investigations of the star formation history. ... the galaxyЫand incorporating a delay in the onset of star formation make it possible to model different scenar- . ios for the evolution of a galaxy's luminosity. ... evolution of massive galaxies. ... of reconstructing the star-formation history and galactic luminosity from observations of galaxies at different . ...

... The plasma region above the ionosphere on such closed magnetic field lines is called the plasmasphere. ... In the first approximation, the plasmasphere lies just inside the ring current and the plasma sheet field lines. ... In addition, plasmasphere is asymmetric, having a clear dusk side bulge (Carpenter, 1970; Chappell et al., 1970; see also Carpenter et al., 1993) that swings westward during high geomagnetic activity (Carpenter, 1970). ... Res., ... 75 , 3837-3847, 1970 . ... 75 , 3848-3861, 1970...

... 2012 November 7 . Superstorm Sandy From Formation to Landfall . Image Credit: NASA , GOES-13 Satellite . Explanation: It was the largest hurricane ever recorded in the Atlantic Ocean. ... Although Hurricane Sandy might have formed at any almost time, concerns are being raised that large storms like Sandy might become more common if water in the Atlantic continues to edge higher in power-enhancing surface temperature. ... About APOD | ... NASA Web Privacy Policy and Important Notices . ...