... 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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... GRACE Maps the Gravity of Earth . ... 23.07.2003 . ... To help better understand the Earth's surface , slight distance changes between a pair of identically orbiting satellites named GRACE have been used to create the best ever map of Earth's gravitational field . ... Maps like this also help calibrate changes in the Earth's surface including variable ocean currents and the melting of glaciers . ... Publications with keywords: GRACE - Earth . Publications with words: GRACE - Earth . ...

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• Астронет > GRACE Maps the Gravity of Earth
• A Gravity Map of Earth
• X-Ray Earth

... 2003 July 23 . GRACE Maps the Gravity of Earth . Credit: GeoForschungsZentrum Potsdam , CSR U. Texas , JPL , NASA . ... To help better understand the Earth's surface , slight distance changes between a pair of identically orbiting satellites named GRACE have been used to create the best ever map of Earth's gravitational field . ... Maps like this also help calibrate changes in the Earth's surface including variable ocean currents and the melting of glaciers . ... About APOD | ...

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• APOD: 2002 January 22 - Neutron Bounce Quantized in Earth Gravity
• APOD: 2013 December 6 - Gamma Ray Earth and Sky
• APOD: December 30, 1996 - X-Ray Earth

... 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. ...

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• Arecibo Radar Discovers Triple Near-Earth Asteroid

Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... One of the rarest but most interesting effects which can be observed with the Irkutsk IS radar is anomal high power signal registraion(coherent echo) due to strong magnetic storms. ... These signals are formed at E-layer heights in the presence of a strong electric field which causes particles to drift. ...

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• East Siberian Center for the Earth's Ionosphere Research. Capabilities and
• East Siberian Center for the Earth's Ionosphere Research. SW radiosignal
• East Siberian Center for the Earth's Ionosphere Research. Specific character

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The Sun gives us light and heat, sustaining life on Earth. ... This uneven rotation, coupled with the churning of the upper layers, might well be what produces (by a "dynamo mechanism", described in a later section) regions of intense magnetic field, seen by observers on Earth as dark sunspots. ... Near sunspots those streamers seem to be shaped by the Sun's magnetic field lines, and above the Sun's poles they suggest field lines rising from twin magnetic poles like those of the Earth. ...

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• Rotating Frames of Reference in Space and on Earth
• Ionosphere [Oulu]
• FAQ: "The Great Magnet, the Earth"

... The Sun gives us light and heat, sustaining life on Earth. ... This uneven rotation, coupled with the churning of the upper layers, might well be what produces (by a "dynamo mechanism", described in a later section) regions of intense magnetic field, seen by observers on Earth as dark sunspots. ... Near sunspots those streamers seem to be shaped by the Sun's magnetic field lines, and above the Sun's poles they suggest field lines rising from twin magnetic poles like those of the Earth. ...

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• The Exploration of the Earth's Magnetosphere"
• FAQ: "The Great Magnet, the Earth"
• FAQ: "Exploration of the Earth's Magnetosphere"

... Energy balance in a planetary atmosphere . The earth is heated by solar radiation; a fraction of the energy absorbed is re-radiated. The temperature within Earth's biosphere depends on the balance between energy absorbed and re-radiated. Certain gases (carbon dioxide, methane) are very efficient at trapping the re-radiated flux . ... More energy leads to higher temperatures - many possible . ... Consider Venus - atmosphere dominated by carbon dioxide . ...

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• Swara's Research interests
• Radiation Damage and Hot Pixels
• HST this week: 250

... Staff . ... Cosmic dust has been observed both in emission and extinction everywhere in our Galaxy as well as in many other galaxies. ... Dust grains are classically thought to form in the winds of Asymptotic Giant Branch (AGB) stars. However, nowadays there is increasing observational evidence for notable dust formation in Supernovae (SNe). ... Hence the observed dust mass of 0.7вИТ0.9M вКЩ in this source can be safely considered as indicative of the mass of freshly formed dust in SN ejecta. ...

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• Dust evolution across the CO snowline in a protoplanetary disk
• On line Resources
• Arcetri Library Classification System

... These trajectories have an initial flight from the Earth to a large distance (of about 1.5 million km), the following passive flight to the Moon's orbit, an approach to the Moon with a decrease of an energy of a particle (spacecraft) selenocentric motion to a negative value and the temporary capture in an elliptic orbit of the Moon's satellite. ... Several trajectories of this type are determined. ... Ivashkin V. V. On optimal trajectories of space flight to the Moon in the Earth--Moon--Sun system. ...

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• http://www.ipa.nw.ru/conference/2002/sovet/PS/PETROVSK.PS
• http://www.ipa.nw.ru/conference/2002/sovet/PS/FOMINOV.PS
• http://www.ipa.nw.ru/conference/2002/sovet/PS/KARDASH.PS

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• The Galaxy Gallery Page 6: Comparative Morphology
• Potential Energy
• Formation of the Solar System

... Research objects and scientific purposes . Space scientific program includes development and launch of two supersmall spacecrafts "Universitetskiy" and "Kompas-2" intended for monitoring of radiation conditions near the Earth. ... All the studies conducted in the near-Earth space are characterised by strong radiation fields. ... The circular polar orbits, which cover all the near-Earth space, are the most favorable for comprehensive studies of the radiation conditions near the Earth. ...

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HIGH RESOLUTION IONOSPHERIC MASS SPECTROMETER P-11 . ... Onboard mass-spectrometric equipment for study of neutral and ionized components of Earth upper atmosphere. Mass-spectrometer P-11 is one of P-series modifications of the on board radio-frequency monopole spectrometers. ... The instruments of P-series have passed successful approbation in space experiments aboard geophysical rockets MP-12, launched for investigation of Earth upper atmosphere (Ref. ... Measured mass number range, AMU - 1.. ...

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• Solar-Terrestrial Connections
• Near-Earth Space
• Olexiy V. Agapitov presentations & posters

... 1.Magnetic and magneto-elastic properties of heavy rare earth metals. ... High magnetic fields of 100 kOe and more were necessary to saturate the magnetization of havy rare earth metals. ... It was shown that the effective exchange field theory is sufficient for the description of the magnetic order in heavy rare earth metals and their compounds. ... The duality of the state of the magnetic carriers in the traditional 3d-magnetic materials. ... LHPP ISSP RAS ? 2004 All rights reserved ...

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... The Moon is steadily moving up and up. ... Earth loses angular momentum because the high tide closest to the Moon is trying to get back directly underneath the Moon, while the high tide farthest from the Moon is trying to get as far away from the Moon as possible. ... Therefore, Solon would still experience some tides and its rotation would still slow down, but not nearly by as much as Earth's. Solon's day would be around eight hours long at this time in its life, 4.6 billion years after it formed. ...

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• ASP: Black Holes to Blackboards: Getting a Global Sense
• ASP: Black Holes to Blackboards: The Sun is a Mass of Incandescent Gas
• ASP: Black Holes to Blackboards: The Magic of Mars

Lectures . ... Home Lectures Lecture Series 2010-2011 Lecture Series 2010-2011 ? Greening the Earth Using Space Resources? by Greg Matloff . ... Lecture Series 2010-2011 . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... Amateur Astronomers Medal . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

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... 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! ...

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• Phil Plait's Bad Astronomy: Bitesize Astronomy
• Phil Plait's Bad Astronomy: Bad TV
• Phil Plait's Bad Astronomy: Bad News:

... Gift Center . ... Why do aurorae appear strongest within rings centered on Earth's poles instead of filled-in circles? ... RELATED TOPICS: AURORAE . The visible aurorae result from electrons that move along magnetic field lines from space into the upper atmosphere. ... Just make sure you're registered with the website. Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ...

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• Asteroid will disintegrate in Earth's atmosphere Monday | Astronomy.com
• Rosetta closes in on Earth | Astronomy.com
• "Of pure ablution round earth's human shores" | Astronomy.com

... Programme . ... Presenter: Nadine Neumayer (ESO) . Abstract: I will present the determination of the mass of the supermassive black hole of Centaurus A using high-resolution integral-field observations of both the gas and the stellar kinematics. ... The black hole mass measurements of both tracers, gas and stars, are in excellent agreement and provide one of the cleanest gas versus stars comparisons of a BH mass determination. ...

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• ATNF Colloquium
• ATNF Daily Astronomy Picture
• Cosmic Engine: The Sun and its Influence on Earth