Astronomy Picture of the Day . Probably a Planet for Beta Pic . ... 28.11.2008 . ... Explanation: A mere 50 light-years away, young star Beta Pictoris became one of the most important stars in the sky in the early 1980s. Satellite and ground-based telescopic observations revealed the presence of a surrounding outer, dusty, debris disk and an inner clear zone about the size of our solar system -- strong evidence for the formation of planets . ... November 2008 . ... 2007 2008 . ...

Hubble Finds Oxygen Atmosphere On Jupiter's Moon Europa . Astronomers using NASA's Hubble Space Telescope (HST) have identified the presence of an extremely tenuous atmosphere of molecular oxygen around Jupiter's second moon, Europa . ... Europa's oxygen atmosphere is so tenuous that its surface pressure is barely one hundred billionth that of the Earth," said Principal Investigator Doyle Hall, of Johns Hopkins. ... The oxygen gas slowly leaks into space and must be replenished continuously. ...

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... Laboratory for atmosphere optics was found in 2000. The main directions of activity of the laboratory . ... The most actual and significant - research of chemical composition of a ground atmospheric slice in conditions of a large industrial center. ... Scientific and industrial optical instrument making. ... Dr. Mikhail G .Sosonkin, senior researcher - head of the laboratory . Yuri S. Ivanov - senior researcher . ... Laboratory for atmosphere optics МАО NANU . ... 380(44)5264539 . ...

... 2008 November 28 . Probably a Planet for Beta Pic . ... Now, infrared observations from European Southern Observatory telescopes incorporated in this composite offer a detection of a source in the clear zone that is most likely a giant planet orbiting Beta Pic . ... Confirmation that the new source is a planet will come if future observations can demonstrate that the source moves in an orbit around the star. ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... The stars of the middle main sequence have relatively quiescent outer layers, and unusual chemical abundance patterns may develop in their atmospheres. ... At present, little is known about the time evolution of these anomalous abundances, nor about the role that diffusion may play in maintaining them, during the main sequence lifetime of such a star. ...

Why do people want to explore Mars? At the present time Mars topography is known sufficiently well to make a Martian map; we cannot distinguish yet the settlements of the inhabitants of this planet, but sooner or later we probably will be able to achieve this as well.. ... US spacecraft "Mariner-4" performed the first successful flyby and transmitted to the Earth twenty one photos of Mars' surface. ... It is supposed that large subsurface ice reservoirs or liquid water exist on Mars. ...

velocity measured in meters per second . ... High speed propeller (vertical) = 42% Clearly, wind power is a highly variable source and hence energy storage is crucial. ... Electricity generated is then .25 KWH per sq. meter . If wind blows 24 hours per day then annual electricity generated would be about 2200 KWH per sq. meter . ... To Generate 10,000 KWH annual then from a 20 mph wind that blows 10% of the time . windmill area = 10,000 KWH/220 KHW per sq. meter = 45 sq meters . ...

... By studying the photospheric abundances of 4 RV Tauri stars in the LMC, we test whether the depletion pattern of refractory elements, seen in similar Galactic sources, is also common for extragalactic sources. Since this depletion process probably only occurs through interaction with a stable disc, we investigate the circumstellar environment of these sources. ... One source shows a very small infrared excess, atypical for a disc source, but still has evidence for depletion. ...

... As a result of BTA observations of 23 chemically peculiar stars with strong magnetic fields, it was found that in 22 of them the longitudinal magnetic field, measured from the hydrogen line cores are considerably lower (by about 1/3) than the value measured from metal lines in the same spectra. ... New approaches need to be developed in order to interpret the data. ... The Zeeman spectrum of a star with a strong magnetic field, 53 Cam. ...

... WORKSHOP "STELLAR ATMOSPHERES" . THE CHEMICAL AND DYNAMIC EVOLUTION OF STARS AND GALAXIES" . ... Chernomorka , Odessa , Ukraine . ... Modeling and interpretation of the stellar spectra of the usual and peculiar stars. Elemental abundances in the stars of different types and populations of the Galaxy. Chemical evolution of the stars and galaxies. ... Andrievsky S.M. (OAO ONU, Odessa, Ukraine) . ... CHEMICAL and DYNAMIC EVOLUTION STARS and GALAXIES" . ... Odessa mailto:astro@paco.odessa.ua . ...

... We cannot use for this purpose equivalent widths and profiles of HI lines (well known criteria of atmospheric conditions for normal supergiants), since these lines are strongly distorted in the spectrum of IRAS04296 as seen in Fig. ... Figure: Upper: iron abundance FeI (circles) and FeII (crosses) calculated for IRAS04296+3429 with model parameters , and using lines with different excitation potentials EP of a low level; bottom: the same as a function of the equivalent width W . ...

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Comets as the Object of Investigation. ... Stratification of Comets Atmospheres and Their Chemical Structure. ... Formation and Change of Surface Dust Layer of Periodical Comets' Nucleas and Their Evolution in Solar Radiation Field. ... Dynamics of Matter in Near-Nuclear Region of Comet Atmosphere in Adiabatic Approximation. ... Kinetic Theory of Gas Stream in Region of Transition between Condition of Continuum to Free-Moleculte Stream. ... Free-Moleculte Stream of Neutral Gas in Comet Atmosphere. ...

If you go out tonight and look up at the full Moon, and you're like most people, you'll probably see the face of a man, or, alternatively, a rabbit superimposed on the bright disk of the Moon. ... When people look at the full Moon, they often see either a Man in the Moon (left) or a rabbit in the Moon (right). ... The Face on Mars is a naturally occurring rock outcropping that just happens to look like a face when lit from the side. ... The Face on Mars,'' Odyssey , October 1991, page 12. ...

... Astronomy news . ... Saturnian Moon Shows Evidence Of Ammonia . Data collected during two close flybys of Saturn's moon Enceladus by NASA's Cassini spacecraft add more fuel to the fire about the Saturnian ice world containing sub-surface liquid water. ... In space, the presence of ammonia provides strong evidence for the existence of at least some liquid water. How could ammonia equate to liquid water inside an ice-covered moon in one of the chillier neighborhoods of our solar system? ...

. ArtistтАЩs impression of an active volcano on Venus. Results from a long-term study of Venus find evidence of a clear injection of sulfur dioxide into its upper atmosphere. One possible interpretation is that volcanic activity increased the sulfur dioxide component of the upper atmosphere, although an alternative is that a change in atmospheric circulation dredged up the gas. // Credits: ESA/AOES

... Aurora from Space . ... Magnetic Storms . ... The "ring of fire" seen by satellite cameras around the polar caps (picture below) is probably created by electrons leaking from the tail's plasma sheet, whose magnetic field lines form a somewhat imperfect trap. ... One possible explanation involves the close association between auroral arcs and electric currents which flow along field lines between the ionosphere and distant space ( Birkeland currents ). ... Why no aurora at the magnetic poles? ...

Next: Antenna gain considerations and Up: Some Theory Previous: Polarisation . To provide correct flux density units for the visibilities, , from an interferometer, the measured correlation coefficient at the correlator ( ) needs to be scaled by a system temperature and a telescope sensitivity factor ( ). ... For a zenith opacity , observing at an elevation of , and if the atmosphere is approximated as having a uniform temperature , then the atmospheric contribution to system temperature is . ...

... Bojan Nikolic web pages (r. 329) . ALMA . ... AATM is a re-packaging of the version of ATM as used by the ALMA online calibration software ?TelCal?. ... The main reason for AATM is to bring the version of ATM used by ALMA to an as wide an audience as possible. ... This version of AATM therefore corresponds exactly to version on ATM-0_3_0 branch of the CVS, and will (I believe) be the same as what is used in ALMA 7.1. ... Computing dispersive atmospheric delay with AATM . ... ATM and AATM . ...