... 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 . ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2006 July 19 . Reflections on Planet Earth . Credit: Michael Fossum, STS-121 Mission , NASA . ... The picture is actually a self-portrait taken by astronaut Michael Fossum on July 8 during a space walk or extravehicular activity while the Discovery orbiter was docked with the International Space Station . ... About APOD | ...

... An Evening Sky Conjunction . ... 19.02.2015 . ... Credit Copyright: Tun Tezel ( TWAN ) Explanation: Eight years ago, an evening sky held this lovely pairing of a young crescent Moon and brilliant Venus . Seen near the western horizon, the close conjunction and its wintry reflection were captured from Bolu, Turkey, planet Earth on February 19, 2007. ... But the February 20, 2015 version of the conjunction will also include planet Mars . ... February 2015 . ... Comet Meets Moon and Morning Star . ...

Winer Observatory P.O. Box 797, Sonoita, Arizona 85637-0797, USA . ... Asteroid . ... Site . ... The evening of October 26, 2011, Mark Trueblood, Robert Crawford, and Larry Lebofsky used the Kitt Peak 2.1-m telescope to observe Near Earth Asteroid (NEA) 2008 QT3. ... single still jpeg frame . ... The National Optical Astronomy Observatory (NOAO) issued a press release concerning Morgan's work on Monday, November 21, 2011 and posted it on the home page of their web site . ... 2013 Winer Observatory. ...

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... The ball of stars at the centre of this photograph is unbelievably old. ... This group of stars, called a globular cluster, is actually 10 billion years old that's almost as old as the universe itself! Globular clusters contain tens of thousands of ancient stars that all formed around the same time, from the same material. But strangely, these clusters sometimes contain stars that look suspiciously young, raising the question: are these clusters really the ancient relics that we believe? ...

Astronotes Armagh Planetarium's Stellar Blog! ... Monthly Sky Notes . ... By admin January 20, 2012 Posted in: Armagh Planetarium . To coincide with the television programme, Armagh Planetarium held a special night on Wednesday 18 January with the fantastic amateur astronomers from the Northern Ireland Amateur Astronomy Society (NIAAS) joining us. At the fore of night sky observing.... the NIAAS (Image credit: NIAAS) . ... Image credit: Julie Thompson, Armagh Planetarium) . ...

... The twilight zone is not just an old television series. ... Most places on Earth pass through the twilight zone twice a day; the result is an enchanting hour at dawn and dusk of low sunlight and long shadows. ... Before assigning your students to watch a sunrise or sunset, have them try the following activities to develop their global sense. ... Armed with a global sense of our spinning planet, go out to watch the sky as your part of the Earth moves through the twilight zone. ...

... One possible application of a solar sail is a spacecraft to warn Earth of approaching interplanetary disturbances and shocks. ... Spacecraft that can provide such a warning are currently stationed at (or near) the Lagrangian L1 point , between the Earth and the Sun--at about 4 times the distance of the moon and 1/100 times that of the Sun. ... Because of the greater distance from Earth, the Earth's pull there is weaker, not enough to make the spacecraft match the Earth's motion around the Sun. ...

... What's New? Bad Astronomy . ... News . ... In a nutshell, the answer is that you would fall down the hole, accelerating (that is moving faster and faster) all the way to the center of the Earth. ... Although gravity would get weaker as you approach the center [of the Earth], your motion would keep you accelerating [the emphasis is mine]. ... Although gravity would get weaker as you approach the center, your motion would keep accelerating. which is correct! ... 2008 Phil Plait. ...