... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Risks Comparable to NEOs . ... The Increasing Rate of Discovery of Asteroids . ... Comet and Asteroid Collision Probabilities . ... Extreme albedo comets and the impact hazard (PDF Format) . ... Asteroid Impact Animations . ... Workshop on Scientific Requirements for Mitigation of Hazardous Comets and Asteroids - 2002 . ... The Spaceguard Survey Report, 1992 (PDF) . Tsunami from Asteroid/Comet Impacts . ...

... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Moon . ... The Magazine . ... Observing . ... 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 . ... A cosmic-ray impact . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Jupiter s Impact Scar . ... Credit: Anthony Wesley Explanation: In July of 1994 pieces of Comet Shoemaker-Levy 9 collided with planet Jupiter. The explosive impacts sent plumes of debris high into the Jovian atmosphere creating dark markings or scars , visible for a time against the cloud bands. ... NASA's Infrared Telescope Facility images from Mauna Kea, Hawaii later confirmed the likely impact site's dark scar and plume of particles in Jupiter's upper atmosphere. ... July . ... July 2009 . ...

... Comet Hyakutake (Todd Lauer, KPNO) . The nucleus of Comet Halley . Comets are `dirty snowballs' - 1 to 10 km diameter lumps of ice (water-ice, methane-ice, CO 2 ice) and dust - which originate from the outer Solar System. ~2 million comets are thought to lie in the Kuiper belt (beyond Neptune's orbit) . as many as 10,000 billion (10 13 ) may reside in the Oort Cloud, distances A typical comet weighs ~100 billion tons and has a velocity of 1 to 10 km/sec relative to the Earth - . ...

Hubble Space Telescope image of Jupiter showing the impact site of comet Shoemaker-Levy 9 fragment G. The image was taken on 18 July 1994 about an hour and 45 minutes after the impact. The impact site is the dark round area below and right of the center of the frame, at about 45 S latitude. ... The fragments of Shoemaker-Levy 9 impacted Jupiter at about 60 km/s and left traces in the atmosphere which could be observed for many weeks. ... Central Latitude/Longitude (deg): N/A . ...

... Recherche dans le site : . Ciel Espace, le magazine qui vous guide toujours plus loin . ... des pages consacr†йes †а la publication de vos photos Mais c'est aussi une vraie communaut†й avec laquelle partager votre passion et nourrir votre curiosit†й. Accueil Observez l'impact m†йt†йoritique sur Jupiter ! ... Jupiter_dans_le_ciel.jpg] . Les effets d†йvastateurs de la collision m†йt†йoritique survenue sur Jupiter le 20 juillet dernier sont bien visibles dans un t†йlescope d'amateur. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2009 September 8 . Unexpected Impact on Jupiter . ... Explanation: Two months ago, something unexpected hit Jupiter. First discovered by an amateur astronomer Anthony Wesley on 2009 July 19, the impact was quickly confirmed and even imaged by the Hubble Space Telescope during the next week. ... About APOD | ...

... Carefully measure the diameter of the craters formed by the impact without disturbing the sand. ... Crater diameter increases with increasing mass. ... Without disturbing the sand, carefully measure the crater diameter. ... Did you measure any difference in the diameters of the craters? Yes, as velocity increases, so does crater diameter. ... Impact cratering. ... Impact craters can be demonstrated with younger or less advanced students using mud instead of sand and ball bearings. ...

... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... Travel to La Silla . ... Travel to E-ELT Armazones . ... Survey Telescopes . ... Images . ... Star Clusters . ... Usage of ESO Images and Videos . ... Usage of ESO Videos and Images . ... Stars@ESO . ... ESO Science Newsletter . ... ESO 3.6-metre telescope . ... Deep Impact - 04.07.2005 . ... SL-9 and Jupiter - 1994 . ... Observations of Shoemaker-Levy 9 impacting Jupiter. ...

... PRESENTATIONS . Session 1: Missions to Jupiter system . ... Lebreton J.-P. (Invited) . ... The Europa-Jupiter System Mission: study results and prospects . ... Session 2: Technical aspects of the Europa Lander mission . ... V. Sasi Prabhakaran (POSTER PRESENTATION) . ... Geophysical investigations for a landed mission to Europa . ... The surface composition of Europa and implications for a landed mission . ... Vorobyova E. Search for Life on Europa: Objectives for Lander Mission . ...

... ATNF Home . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Astrophysics graduate student programs . ... Australian Square Kilometre Array Pathfinder . Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . ... Visiting Parkes radio telescope . Visiting Australia Telescope Compact Array . ... Radio emission from Jupiter was first serendipitiously discovered at decametric wavelengths by Franklin and Burke in 1955. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Solar System . ... Comets and Asteroids . ... Milky Way . ... Space Flight . ... Earth Satellites . ... At its close on Saturday 23 April, there will be the Cosmic Threats to Earth Public Lecture Event (followed by the End of the World Ceilidh to cheer everyone up). ... аThere have been several such impacts in EarthтАЩs history. ... Of the three my greatest concern would and asteroid impact; simply because it has happened before. ...

T he Siding Spring Survey (SSS) is a Near-Earth Object search program that utilises the 0.5-m Uppsala Schmidt Telescope at Siding Spring Observatory, N.S.W., Australia. ... The mission of the Siding Spring Survey is to contribute to the inventory of near-earth objects (NEOs), or more specifically, the potentially hazardous asteroids (PHAs) and comets (PHOs) that may pose a threat of impact and thus harm to civilization. ... Based on the CSS Mission page . ... Siding Spring Survey Main Page . ...

... S.P. KOROLEV ROCKET AND SPACE CORPORATION ENERGIA . ... OAO RSC "Energia" . ... Company's History . ... History . ... In implementation of long-duration manned space flights it is required to identify space radiation impact on human beings. ... Research into space radiation distribution throughout the station flight trajectory. ... Data necessary to predict radiation hazards risk for future space projects and to develop the ISS radiation monitoring aids. ... 2015 JSC "S.P. Korolev RSC "Energia" . ...

... A.V. Eliseev . ... V.V. Adushkin, A.V. Vityazev, D.O. Glazachev, G.V. Pechernikova . Exogenous factors in the evolution of the Earth. ... Cosmic rays as a factor of biospheric evolution . ... A.V. Yakushev, N.A. Churilin, V.S. Soina, A.G. Kudinova, E.A. Vorobyova, N.S. Mergelov . ...

... Report on Cosmic Call 1999 . ... Cosmic Call Sessions . ... This Report outlines methodology, hard- and software, which were developed to transmit first public Interstellar messages from Evpatoria Deep Space Center (EDSC), and describes four Cosmic Call Sessions, which were fulfilled in EDSC on May 24 and June 30 - July 1, 1999. ... Each Cosmic Call consists of two parts. ... Dutil Message, . ... The software for gathering all messages and creating the Cosmic Call stream, was written on C language. ...

... Bad Astronomy . ... Every few months, one of a series of questions comes up on the USENET group sci.astro involving tides, or the rotation of the Moon, or the recession of the Moon from the Earth. ... Why the Moon's rotation period is the same as the length of time it takes to orbit the Earth (same as number 1, but phrased differently). ... But when this happens, the time it takes for the Earth to rotate once will be slowed to exactly the same time it takes for the Moon to go around the Earth once! ...

... About meteorites . ... Meteoritic data . Impact Crater Smerdyachee . ... Based on Smerdyachee's depth, near circularity, and its mounded wall, and analysis by N.A. Fillin of nearby Roshal, Russia, the Estonian scientists Yu.V. Krestlane and K.H. Mella proposed in 1987 that Smerdyachee Lake is a meteorite crater. ... In 2002, the Laboratory of Meteoritics of the Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences explored this mysterious lake. ...

National Aeronautics and Space Administration . ... JOHN E. BLAHA (COLONEL, USAF, RET.) NASA ASTRONAUT (FORMER) . ... EDUCATION: Graduated from Granby High School in Norfolk, Virginia, in 1960; received a bachelor of science in engineering science from the United States Air Force Academy in 1965 and a master of science in astronautical engineering from Purdue University in 1966. ... NASA EXPERIENCE: Selected as an astronaut in May 1980, Blaha has logged 161 days in space on 5 space missions. ...

... A violent event of a different type occurred in March 1991, when a powerful interplanetary shock wave hit the Earth's magnetic field and created a new radiation belt. ... At 03:42 Greenwich time on March 24, 1991, the population of high-energy electrons and protons trapped in the Earth's magnetic field suddenly received huge reinforcements. ... The passage of the shock also left Earth with a new long-lived belt of high-energy protons. ... The horizontal axis measures distance from the Earth's center...