... 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 . ...

... Credit: J. Aasland , Norway Explanation: Does a comet's dust tail always orbit behind it? Since comets rotate, they shed gas and dust in all directions equally. Small ice and dust particles expelled by the comet, however, are literally pushed around by sunlight. ... When the comet is headed inward, sunlight slows down small particles so they orbit behind the comet. When the comet is headed back out though, sunlight speeds them up, so small particles orbit in front of the comet. ...

... April 3, 1997 . Earth, Clouds, Sky, Comet . ... Explanation : Does a comet's dust tail always orbit behind it? ... Small ice and dust particles expelled by the comet, however, are literally pushed around by sunlight. ... When the comet is headed inward, sunlight slows down small particles so they orbit behind the comet. When the comet is headed back out though, sunlight speeds them up, so small particles orbit in front of the comet. ... About APOD > . ...

... Planets . ... Earth Satellites . ... The newly discovered ?mega-Earth? ... Its sibling, the lava world Kepler-10b, is in the background (the two planets? proximity is grossly exaggerated) .€а Kepler-10c has a diameter of about 29 000 km, 2.3 times as large as Earth, and weighs 17 times as much. ... The first mega-earth to be discovered is Kepler-10c which orbits a star lying about 560 light years from the Sun in the constellation Draco. ... Astronomers Find a New Type of Planet: The ?Mega-Earth? ...

Classroom Activity: A Viewgraph Comet . ... This will simulate the Earth's orbit around the Sun. ... Draw several comets along the path with their tails pointing away from the Sun. ... You can create other viewgraphs that have a smaller scale and show several comet orbits or constellations. ... Show how the Earth's orbit is almost circular compared to the comet's. Explain that the Sun is at the focus of the orbits of the planets, asteroids, and comets. ... Actually, comets have two tails. ...

Image credit: Michael Nolan, Arecibo Observatory. These radar images of near-Earth asteroid 2001 SN263 were obtained on 2008 Feb 12 and 13. ... Image from Feb 12 . ... First near-Earth triple asteroid discovered by Arecibo Observatory . ... was discovered this week by astronomers at the sensitive radar telescope at Cornell University?s Arecibo Observatory in Puerto Rico. ... For example, Arecibo has discovered more than half of the near-Earth binary asteroid systems discovered since 1999. ...

The AstroGuide . ... AstroGuide | ... AstroGuide Listing . ... See many more Astronomy Listings by: Category or Alphabet . This project was established in mid-1998 to help coordinate, and provide a focal point for, the study of those comets and asteroids that can approach the Earth's orbit. ... Web Site . ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . are trademarks of John Huggins ...

... An artificial comet holds secrets to Earths life . ... Supernova showered Earth with radioactive debris . ... Get to Know the Night Sky . ... What is the chance that Earth could pass through the debris field of Comet ISON (C/2012 S1) and get a meteor shower? ... RELATED TOPICS: COMET ISON | COMETS | ... Earth already has passed through Comet ISON s debris field which occurred around January 12, 2014 but no one detected a meteor shower. ... Get instant access to subscriber content on Astronomy.com! ...

Comet C/2006 P1 (McNaught) . ... Jan. ... COMETS . In 2009 the 39 periodical comets will return to perihelions. Comet C/2004 Q2 (Machholz) . ... Comets 8P/Tuttle and 17P/Holmes (at right) . ... Time . ... P/2002 CW 134 (LINEAR) . ... P/2003 K2 (Christensen) . ... 13.0 m . ... P/2002 JN 16 (LINEAR) . ... P/2003 O3 (LINEAR) . ... P/2002 Q1 (Van Ness) . ... Note: All time moments are given in Universal Time (UT) units. For Kyiv Local_Time=UT+2 h (and Local_Time=UT+3 h for summer time). ...

... 2000 March 25 . The Earth Also Rises . Credit: The Lunar Orbiter Project , NASA . Explanation: The Lunar Orbiter 1 spacecraft was launched in 1966 to map the lunar surface in preparation for the Apollo moon landings . NASA's plucky robotic explorer performed its job well and pioneered this classic view of the Earth poised above the lunar horizon. The first humans to directly witness a similar scene were the Apollo 8 astronauts . ... About APOD | ... NASA Technical Rep.: ...

... Listed below are questions submitted by users of "The Great Magnet, the Earth" and the answers given to them. ... In "The Exploration of the Earth's magnetosphere" on the magnetic environment of the Earth in space (a few Q duplicated here) . ... 11) Magnetic Shielding . ... 51) Can electricity be generated from the Earth's magnetic field? ... 9) Measuring Earth's magnetic field . ... 6) Reversals of the Earth's field (4 queries) . ... 42) Could generated electricity affect Earth's magnetic field? ...

... Listed below are questions submitted by users of "The Great Magnet, the Earth" and the answers given to them. ... In "The Exploration of the Earth's magnetosphere" on the magnetic environment of the Earth in space (a few Q duplicated here) . ... 11) Magnetic Shielding . ... 51) Can electricity be generated from the Earth's magnetic field? ... 9) Measuring Earth's magnetic field . ... 6) Reversals of the Earth's field (4 queries) . ... 42) Could generated electricity affect Earth's magnetic field? ...

... Bad Astronomy . Misconceptions . ... Bad Astronomy : The Moon only shows one face to us because it is not rotating. Better astronomy : The Moon only shows one face because it is rotating, once every time it revolves around the Earth. ... Place the Moon model on the table about 30 centimeters (one foot) away with the X facing the Earth model. ... You'll see that to keep the X facing the Earth model, you have to rotate the Moon model as it goes around the Earth model . ... 2008 Phil Plait. ...

... Р?С?С?С?Р?Р?Р?Р?РеС?Р?С?Р?РеР? ... Launched on February 17, 1996, the Near Earth Asteroid Rendezvous (NEAR) mission is to be the first of NASA's Discovery missions, a series of small-scale spacecraft designed to proceed from development to flight in under three years for a cost of less than $150 million. ... The ultimate goal of the mission is to rendezvous with and achieve orbit around the near Earth asteroid 433 Eros in February, 1999, and study the asteroid for approximately one year. ...

... Научная панорама ? arxiv:0709.0752 Sky in Google Earth . ... arxiv:0709.0752 Sky in Google Earth (Sky in Google Earth: The Next Frontier in Astronomical Data Discovery and Visualization) . ... Описан проект <A HREF=" http://earth.google.com/sky/index.html ">Sky in Google Earth</A>. ... http://xray.sai.msu.ru/~polar/sci_rev/167.html#arxiv/0709.0752 . ... Еще они нам сказали, что image processing для DSS2 какие-то фонари в Гуггле делали 2 года!! ... А черт знает что там они делали два года. ...

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The Earth. ... The middle raiding of the Earth is 6371,032 km, the pole 6356,777 km equatorial - 6378,160 km. The Earth surface area is 510,2 mln km^2, 70,8% of which is the World ocean. ... According to the modern cosmogonical views the Earth was formed 4,6 - 4,7 billions years ago from the protoplanet cloud captured by the Sun. ... The Earth is conditionally divided into 3 parts: a bark a cloak and a core (in the centre). The external layer - the bark is 35 km thick. ... Above the Earth. ...

... Comments, Opinions Publications Dnepr Program . Dnepr launch record 17 August 2011. Cluster Launch of Dnepr LV 22 August 2013 KOMPSAT-5 Launch 21 November 2013. ... The Sych-2 satellite is being developed as a part of the space optical-range Earth observation system by the State Design Office of Yuzhnoye and built by the Industrial Association Yuzhny Machine Building Plant in cooperation w ith other space industry entities upon the state order of the National Space Agency of Ukraine . ...

... comet nucleus. ... Very Long Baseline Interferometry (VLBI), Near Earth Objects (NEOs), cometary families , terrestrial type planets, collidings, transition of a comet nucleus , initial heliocentric parabolic orbit, heliocentric elliptical trajectory, a pairwise three dimensional two-body problem, the Sun - comet nucleus , terrestrial planet - comet nucleus , orbital parameters of a nucleus , sphere of influence of a ...

HST Call for Proposals and HST Primer for Cycle 24 . ... Hubble Space Telescope Primer for Cycle 24 > Chapter 2: System Overview > 2.2 Orbital Constraints . ... Orbital Constraints . ... HST is in a relatively low orbit (less than 600 km above Earth), which imposes a number of constraints upon its observations. ... As the HST orbit precesses and the Earth rotates, the southern part of the HST orbit intersects the SAA each day for seven to nine orbits in a row (so-called ?SAA-impacted? orbits). ...