... 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 . ...

The radius of the event horizon of a black hole with the mass of the Sun would be about 3 kilometers, about the same size as your city, town or village. If the Earth could be compressed into a black hole, the radius of its event horizon would be 1/330,000 of this, because the mass of the Earth is 1/330,000 times the mass of the Sun. ... 30,000,000 . ... 20,000 . ... Black hole event horizon . ... MYTH: All stars collapse to become black holes upon their death. ... MYTH: Black holes are very dense. ...

... SS433 is a close binary system, one star is a supergiant, a second one is a black hole. ... Even a black hole cannot accept such an enormous mass flux, a supercritical accretion disk appears, all the excess gas glows up to several tens of thousands degrees and is ejected off the disk with enormous velocities. ... SAO researchers have found an evidence of the supercritical accretion onto a black hole in SS433, which follows from a brightness variability of the SS433 disk. ...

... NASA's Hubble Space Telescope offers a stunning unprecedented close-up view of a turbulent firestorm of starbirth along a nearly edge-on dust disk girdling Centaurus A, the nearest active galaxy to Earth. A ground-based telescopic view (upper left insert) shows that the dust lane girdles the entire elliptical galaxy. This lane has long been considered the dust remnant of a smaller spiral galaxy that merged with the large elliptical galaxy. ...

... VLA , NRAO Explanation: An object many astronomers believe is a black hole has been found only 1500 light-years from Earth, making it the closest black hole candidate . ... V4641 is the fourth known microquasar , a miniature version of the massive, matter spewing black holes thought to exist in the centers of galaxies . ... Publications with keywords: black hole - radio source - X-ray source . Publications with words: black hole - radio source - X-ray source . ... Jumbled Galaxy Centaurus A . ...

... 2000 January 17 . V4641 Sgr: The Closest Black Hole Candidate . ... Explanation: An object many astronomers believe is a black hole has been found only 1500 light-years from Earth, making it the closest black hole candidate . ... Astronomers are working to understand why V4641 acts strangely even for a black hole , as the explosions it creates fade within minutes, and appear at different times in different bands of light . ... About APOD | ...

... Bad Astronomy . Misconceptions . ... Bad Astronomy : If the Sun collapses into a black hole, the Earth and all the other planets will get sucked in. Good astronomy : If the Sun were to collapse into a black hole, we would feel no difference in the gravity as measured at the Earth. ... The same applies if the Sun were to collapse into a black hole. ... Therefore, the gravity of the Sun felt at the Earth would remain the same. ... So it is with the black hole Sun. ... 2008 Phil Plait. ...

... Our Sun is part of a huge wheel-shaped collection of stars. ... Astronomers have long suspected it was a very massive black hole, and that every galaxy had such a central mass, created early in the history of the universe. ... However, unless that object happens to be headed directly at the black hole (a relatively small target) it will just swing around and fly away again, like a comet making a pass at the Sun. The velocity acquired in falling towards the black hole also helps it escape. ...

... Ask Astro . ... Supernova showered Earth with radioactive debris . Behemoth black hole found in an unlikely place . ... black holes . ... Asteroid DayУ?т??т??s Don Yeomans: Will asteroid 2013 TX68 strike Earth? ... Ask Astro: What are the chances of dark matter or a black hole ripping apart Earth? ... Get instant access to subscriber content on Astronomy.com! ... Receive full access to our Ask Astro answers . ... A gamma-ray burst hints that LIGO's double black holes started as one massive star . ...

... Special Reports Giant space cloud may be powered by black holes 17:57 23 April 2007 NewScientist.com news service David Shiga An enormous cloud of roiling plasma in space may be drawing its energy from black holes, new observations suggest. Such clouds might be sources for the mysterious particles that occasionally crash into Earth's atmosphere at ultra - high speed. ... But higher energy particles in the cloud may be able to escape, he says. ...

This animation (MPEG 4.8 Mb) shows the motions of stars caught in the gravitational field of a three-million solar mass black hole in the core of the nearby galaxy M32 . Stars swarm around the black hole like angry bees around a hive. The animation is based on computer simulations and new Hubble Space Telescope observations of M32 . ... In 1992, Hubble observations measured a bright peak, or `cusp' of starlight that independently suggested that the stars were concentrated around a black hole. ...

Beauty, the beast, and gravitational waves Sterl Phinney Caltech E.S. Phinney Medlow Bath 18 Jun 2008 Beauty, E.S. Phinney Medlow Bath 18 Jun 2008 Beauty, The black holes of nature are the most perfect macroscopic objects there are in the universe: the only elements in their construction are our concepts of space and time. ... E.S. Phinney Medlow Bath 18 Jun 2008 The AGNobservers evolution of BH mass function ("downsizing") Big black holes grew up early (z>3). ... E.S. Phinney Medlow Bath 18 Jun 2008 ...

Proceedings of the Particle Physics and Early Universe Conference (PPEUC). For this paper: postscript PPEUC CMB index 1 Introduction.. ... Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BZ, U.K. An imploding shell of radiation is shown to create a 2-D black hole within the framework of the `` '' theory. ... The radiation emitted very far from the black hole is thermal with temperature . ... 4 Black hole structure . 5 Thermal radiation and back-reaction . ...

Next: Cyg X-1 as a Up: Black Holes in Binaries Previous: Black Hole Creation in . The discovery of binary radiopulsars with massive unseen companions ( >3- ) would be of great importance to fundamental physics and modern theory of stellar evolution, providing a compelling evidence for the existence of BH in nature. The formation of binaries consisting of a BH in a pair with a radiopulsar (PSR) has been discussed previously by Narayan et al. ... Здесь должна быть Table 11 (Note к Table 11) . ...

... Feeding the Monster: Gas Caught in its Death Spiral into a Massive Black Hole . ... Stromlo Professor Mike Dopita have used the Hubble Space Telescope to discover how a massive Black Hole in a nearby galaxy feeds itself. ... Earlier Hubble Telescope data obtained by another team member, Professor Holland Ford of Johns Hopkins University in Baltimore, Maryland, had found a disk of gas rushing around the Black Hole at a speed of 500 kilometers a second. ...

... Events . ... The Event Horizon Telescope: Observing Black Holes with Schwarzschild-Radius Resolution . ... Galaxy lies a super massive black hole - 4 million times more massive . ... Universe to spatially resolve and image a black hole Event Horizon. ... For the much more massive (6 billion solar mass) black hole . ... for assembling a submm-VLBI Event Horizon Telescope. ... emission near the event horizon of super massive black holes. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

Tori & Winds, Leicester 14 September 2004 Disk Winds - tests? ... Tori & Winds, Leicester 14 September 2004 Elvis 2000: pluses, minuses q UV/X-ray connection · FUSE, STIS partial covering, transverse; broader abs = edge-on [Kriss, Kaastra] · location: disk or torus [M.E., Kriss, Kaastra] · WA variability. ... BELR in wind? ... Fabian] Tori & Winds, Leicester 14 September 2004 Black Hole Evolution q Obscured population, vs z. [Simpson] Just a phase black holes go through? q Star formation in disk. ...

... Drifting electron holes (DEHs), originally found in the geosynchronous particle data (Sergeev et al., 1992) are substorm related regions of decreased energetic (tens and hundreds of keV) electron fluxes that drift around the Earth just like electron injections (enhancements of fluxes) do. ... 1996). Sergeev, V. A., T. BЖsinger, R. D. Belian, G. D. Reeves, and T. E. Cayton, Drifting holes in the energetic electron flux at geosynchronous orbit following the substorm onset, J. Geophys. ...

... 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? ...