... Tonight's Sky . ... The Magazine . ... Star Atlas . ... An artificial comet holds secrets to Earths life . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... The planet has extreme temperature swings and perhaps active lava flows. ... A digital supplement to Astronomy magazine. ... Join TravelQuest International with Astronomy and Discover magazines on one of three great tour options surrounding this celestial spectacle . ... Astronomy Magazine . ...

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• Ancient super-bright quasar with massive black hole found | Astronomy.com
• Kepler astronomers discover ancient star with five Earth-sized planets |
• We often read of discovering exoplanets. How far away from Earth would we be

... 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 . ...

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• Armagh Observatory
• Sun Earth Day
• Armagh Astropark: The Planets

... NASA , NSF Explanation: Is our Earth unique? In continuing efforts to answer this question, astronomers have now discovered an Earth-like planet orbiting a distant normal star. ... Slight, fast, but regular wobbles of nearby small M - dwarf star Gliese 876 showed evidence for a planet with a likely mass slightly higher than a minimum six times the mass of Earth. ... Publications with keywords: planets - Earth - Gliese 876 . Publications with words: planets - Earth - Gliese 876 . ...

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• XWare > APOD
• Астронет > Saturn-Sized Worlds Discovered

... Exoplanets . ... Artists impression of the blue exoplanet. ... This exoplanet is located in the constellation of Vulpecula, the fox, a faint pattern inside the Summer Triangle.ТљТљ This planet is a not too distant 63 light years away so has been studied by space-based telescopes.Тљ Data collected from Hubbleт??s Imaging Spectrograph (STIS) when this planet moved behind its star showed that in the shadow of the star the light reflected from HD 189733b reduced into the blue part of the spectrum. ...

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• Exploring Icy Moons in Search of Life | Astronotes
• Kepler-10b: world of lava oceans? | Astronotes
• COROT-7b: Exoplanet with a sky made of stone | Astronotes

... Each day we feature a different image or photograph of our fascinating universe, along with a brief explanation written by a professional astronomer. August 15, 1995 . Venus: Earth's Sister Planet . ... Explanation: This picture in visible light was taken by the Galileo spacecraft. Venus is very similar to Earth in size and mass - and so is sometimes referred to as Earth's sister planet - but Venus has a quite different climate. ... Chronological Archive | Subject Sorted Archive | ...

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• APOD: 2012 April 27 - Jupiter and the Moons of Earth
• APOD: 2005 June 14 - Gliese 876 System Includes Large Terrestrial Planet
• APOD: 2013 November 5 - Kepler 78b: Earth-Sized Planet Discovered

... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Slacker Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Life Under the Moon . ... Seeing Jupiter's Moons . ... Time Zones and the Spherical Earth . A Companion to the Earth? ... December 19, 1999) . ... Big Moon, Little Moon . ... How Big is the Moon? ... 14, 2000) . ... 2008 Phil Plait. ... Subscribe to the Bad Astronomy Newsletter! Talk about Bad Astronomy on the BA Bulletin Board! ...

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• Phil Plait's Bad Astronomy: Misconceptions
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... 142,800 Mean density (kg/m^3) .. ... 5.203 Rotation period (length of day in Earth hours).. 9.8 Revolution period (length of year) (in Earth years). 11.86 Obliquity (tilt of axis) (degrees).. 3.08 Orbit inclination (degrees).. 1.3 Orbit eccentricity.. 0.048 Mean surface temperature (K)........................ 120 (cloud tops) Visual geometric albedo.. 0.44 Atmospheric components.............................. 90% hydrogen, 10% helium, .07% methane Rings.. ...

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• Nov 18: Uranus/Neptune
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• Formation of the Earth's Moon

Metis . Jupiter XVI - 1979J3 . Metis [MEE-tis] is the innermost known satellite of Jupiter. ... Metis and Adrastea lie within Jupiter's main ring and may be the source of material for the ring. ... Galileo Image of Metis . ... Although Metis was discovered by Voyager, it was no more than a point of light on images. This Galileo image is the the first image of the small moon that shows its irregular shape. ... The longest dimension of Metis is approximately 60 kilometers (37 miles) across. ...

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• Jupiter's Moon Thebe
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... 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. ...

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... Over the past decade and a half, astronomers have used both ground-based and space-based telescopes to discover more than 400 "extrasolar" planets. The Kepler space-based mission uses a technique called transit photometry to search for these planets. In January 2010 the Kepler mission team announced the discovery of five new planets. ... The ultimate goal of the Kepler mission is to search out the existence of Earth-like planets. ... A Collection of Resources to Get Behind the Headlines . ...

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• ASP: Black Holes to Blackboards: Getting a Global Sense
• ASP: A Good Definition of the Word "Planet": Mission Impossible?
• ASP: Black Holes

... 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. ...

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• The Io Dynamo
• Magnetospheres and the Universe
• Planetary Magnetism

EMBARGOED UNTIL: 9:20 AM CST, January 6, 1999 CONTACT: John Biretta Space Telecsope Science Institute, Baltimore, MD (Phone: (410) 338-4917; Internet: biretta@stsci.edu) HUBBLE DETECTS FASTER-THAN-LIGHT MOTION IN GALAXY M87 Astronomers reported today discovering clouds which appear to move many times faster than the speed of light, shooting out from the region of a black hole at the center of the M87 galaxy. ... It's an illusion created by the finite speed of l