Astronomy Picture of the Day . Deep Impact on Comet Tempel 1 from Hubble . ... 18.07.2005 . ... At the direction of terrestrial scientists , a refrigerator-sized probe from the Deep Impact mission struck Comet Tempel 1 on July 4 at over 35,000 kilometers per hour. ... Astronomers will continue to study the images and data returned by Deep Impact to better determine the nature of Comet Tempel 1 and discern clues about the formation dynamics of the early Solar System . ... July . ... July 2005 . ...

... Armagh Planetarium . ... Universe . ... 25 Comments Space is something that fascinates many.€а Every day there are technological advances, new research being carried out and even historical space related anniversaries.€а Where would we be without those valuable [ ] . ... No Comments A new image from the European southern ObservatoryтАЩs Visible and Infrared Survey Telescope for Astronomy €а(VISTA) telescope reveals the glowing clouds of gas and filaments of dust surrounding hot young [ ] . ...

... The awsome spectacle of a brilliant comet, with its long ghostly tail streaming behind it, is a rare event. ... Only one other comet, Comet Halley, was seen so far from the Sun, giving scientists an opportunity to watch it as it slowly warmed up and sprouted a tail. ... Comets are the Rip Van Winkles of the solar system -- mini-worlds that have changed little during their 4.5-billion-year nap far from the Sun. ... Observing Comets . ... Once, comets inhabited the entire solar system. ...

... 2005 July 18 . Deep Impact on Comet Tempel 1 from Hubble . Credit: P. Feldman ( JHU ) H. Weaver ( APL ), ESA , NASA . ... At the direction of terrestrial scientists , a refrigerator-sized probe from the Deep Impact mission struck Comet Tempel 1 on July 4 at over 35,000 kilometers per hour. ... Astronomers will continue to study the images and data returned by Deep Impact to better determine the nature of Comet Tempel 1 and discern clues about the formation dynamics of the early Solar System . ...

... Each year a few long-period comets, with orbital periods typically a million years, arrive in the planetary system. ... There should be about 5,000 such objects over 10km across, and perhaps 50,000 over a kilometre across. ... However Bill Napier, and Chandra and Janaki Wickramasinghe at Cardiff University, have shown that this explanation doesn't work: the dust so created would yield many strong annual meteor streams without parent comets, and these are not observed. ...

... The street address of the Space Telescope Science Institute is: . ... Turn right onto Pratt Street and continue east to Calvert Street. Turn left on Calvert Street and proceed north approximately 3 1/2 miles to University Parkway. Turn left on University Parkway and proceed approximately 1/3 mile (past JHU stadium and down hill) to San Martin Drive. Turn left at the signal and proceed approximately 1/4 mile to STScI. ... Turn right at signal and proceed approximately 100 yards to signal. ...

Last panoramic mosaic of comet P/Shoemaker-Levy 9 (SL-9) taken by the Hubble Space Telescope. ... The comet fragments stretch across 1.1 million km of space. ... Central Latitude/Longitude (deg): N/A . ... Instrument: HST wide field Planetary Camera 2 . ... Instrument Field of View (deg): 0.0097 x 0.0097 . ... Illumination Incidence Angle (deg): N/A . Phase Angle (deg): N/A . ... Surface Emission Angle (deg): N/A . ... NASA Image ID number: STScI-PR94-26d . ... Greenbelt, MD 20771, USA . ...

... Comet Animation . ... Comet structures are diverse and very dynamic, but they all develop a surrounding cloud of diffuse material, called a coma, that usually grows in size and brightness as the comet approaches the Sun. ... As comets approach the Sun they develop enormous tails of luminous material that extend for millions of kilometers from the head, away from the Sun. ... The evaporated molecules boil off and carry small solid particles with them, forming the comet's coma of gas and dust. ...

This image shows the infrared emission from the young star Fomalhaut and the dust disk surrounding it, as recorded with ESA's Herschel Space Observatory at a wavelength of 70 micron. To explain the emission from Fomalhaut's debris disk, astronomers invoke a steady production of dust particles via comet collisions, with an average rate of 2,000 daily collisions between comets of 0.6 mile (1 kilometer) across or, alternatively, of two daily collisions between 6-mile-diameter (10km) comets. ...

... The images in this animation were taken using the Harvard-Smithsonian Center for Astrophysics MicroObservatory remote-controlled telescope in Arizona and processed using the MicroObservatory Image 2.1 software. ... The two images in this animation were taken at exactly the same time (2010-Oct-08, 0600 UTC), one from the remotely controlled telescope in Cambridge, MA, and the other from the remotely controlled telescope in Arizona. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... Bad Astronomy . ... Bad Astronomy : Comets whiz across the sky in a few seconds. Good astronomy : Comets appear to move very slowly, usually taking days to noticeably move. ... The orbital periods of comets are measured in years; the most famous comet of all, Comet Halley (usually--- and incorrectly-- called ``Halley's Comet''), takes about 76 years to orbit the Sun just once. ... Now, when a comet gets near the Earth, it tends to be moving pretty quickly. ... Want to know more about comets? ...

... Bringing news from across the Universe to children all around the world . ... Occasionally a comet makes the newspaper headlines when it makes a dazzling light show across our night sky. ... In reality, thousands of comets have been discovered in our Solar System and many more waiting to be found. ... Like planets, comets orbit their star. ... Cool fact : Around 4,000 comets have been counted in our Solar System, but its believed that the true number could be more like a trillions! ...

Vega Stamps . International project VEGA was managed by Space Research Institute (IKI) . ... VEGA-1 and VEGA-2 spacecraft were developed by Babakin Space Center and fabricated by Lavochkin Association in Khimki, Moscow region. ... VEGA-1 and VEGA-2 have been the part of the international fleet to Halley's comet, that also included Giotto mission of European Space Agency (ESA) and Sakigake and Suisei by Institute of Space and Aeronautical Science (ISAS) of Japan. ... Vega 1 . ...

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. ...

... An estimate the rotation period of cometary nuclei is important for understanding and describing the physical processes of the cometary activity. Unfortunately, the measurements of the rotation periods of the comet nucleus depend on the model assumptions and it is one of the main reasons for the scatter of the estimates given in various articles for a given comet. ... Right: the image of the comet 29P/Schwassmann-Wachmann 1 obtained at the 6-m telescope. ...

. [ Go back to Comet WWW site ] . Andrew A. Martis . martis @ sai.msu.ru .