... Listed below are questions submitted by users of "The Exploration of the Earth's Magnetosphere" and the answers given to them. ... The ones included below are either of the sort that keeps coming up again and again--the danger of solar eruptions, the reversal of the Earth's magnetic field, etc.-- or else the answers make a special point, going into extra details which might interest other users. ... Radiation Belts and Manned Space Flight . ... Capturing the Energy of the Solar Wind . ...

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• The Answer Man--arranged by subject
• Frames of Reference: The Basics
• The Rotating Earth

An astronaut in low Earth orbit moves in (approximately) a big circle extending around the Earth. ... That can be interpreted as stating that in the astronaut's frame of reference, all bodies are subject to two forces, gravity and the centrifugal force, and the two are in perfect balance, adding up to zero. ... Wheel-shaped space . ... The science-fiction film "2001: A Space Odyssey" featured spinning space station, whose rotation provided the crew with "artificial gravity." ...

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• The Sun
• The Acceleration of the Aurora
• FAQ: "The Great Magnet, the Earth"

S P E C I A L R E P OR T F F 62 ROM SLOWDOWN to SPEEDUP By Adam G. Riess and Michael S. Turner Distant supernovae are revealing the crucial time when the expansion of the universe changed from deceler ating to acceler ating tion. ... Gravity keeps us grounded. ... Although Einstein's general theory of relativity allows for gravity to push as well as pull, most physicists regarded this as a purely theoretical possibility, irrelevant to the universe today. ...

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• Black holes in galactic nuclei
• Dr. Adam Riess - Dark Energy
• brown dwarfs - 1

... This appartus will drop a mass from different heights. When the mass strikes the ground, some percentage of its original energy will be absorbed by the ground. ... The percentage of the energy which is absorbed by the surface on each "bounce" (EAS) . ... The impact velocity of the object will also be given at each bounce. ... Start= Drop the ball after Energy, Mass and EAS have been set; resume after step or pause has been selected . ... Reset = Reset experiment to intial values . ...

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• Energy From the Wind
• Climatology; Ice Ages
• Astronomy HyperText Book: Stellar Evolution

... Gravity is responsible for keeping your feet on the ground and keeping the Earth and all other planets in our Solar System in their orbits around the Sun. ... Einstein's theory of gravity, known as the theory of General Relativity. This suggested that gravity is actually the curving of the fabric of the Universe, known as 'spacetime', around objects. For instance, a very heavy star warps the space around it, causing a deep well in the fabric, and pulling in anything that comes too close. ...

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• http://www.eso.org/~hboffin/Astronet/Presentations/Panel_A.pdf
• Aurora around one of the Earth's poles | ESO
• Los Cielos de Am , The darkest sky and the two galactic hemispheres

... This talk focuses on exploring the connection between Ly absorbers and galaxies. The theorist view of gas in the low z universe is based on the filamentary structures that are evident in simulations based on the CDM paradigm. ... The observer's view of gas in the low-z universe is based on the Ly absorbers which have column densities as low as 10 cm , while galaxies are at column densities of 10 cm . ... The absorber has N cm . ... Can examine LSS defined by gas-rich galaxies around absorbers. ...

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• RFI Issues at AO
• on,off position switching offsets
• Galactic ALFA Surveys

Question 1: Ice Storm Safety System (Energy) . ... Question 3: Long Jump (Projectile Motion) . ... Question 3: Washing Windows (Forces and Torques) . ... Question 1: Star and Dark Matter (Circular motion, gravity) . Question 2: Turning Aircraft (Circular motion, force components) . Question 1: Pushing a Box (Normal force, Friction) . Question 2: Ladders (Friction, Normal Forces, Torques) . ... Question 2: Driving around a banked corner (Friction, Circular motion, Normal Forces, Vectors) . ...

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• Pink Black Holes: Frequently Asked Questions
• Worked Example 02
• Pre-Lab 1

... 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: Bad News
• Phil Plait's Bad Astronomy: Mad Science
• Phil Plait's Bad Astronomy: Bad News:

What happens to a star heavier than five solar masses? ... Stars about ten solar masses probably behave like our five solar mass star until they reach the end of core-helium burning. ... The Crab nebula was formed after a massive explosion ripped a star apart in 1054. ... Today, the glowing outer layers of the star are still rushing away from a tiny star in the centre. ... An incredible explosion rips through the outer layers of the star, releasing colossal amounts of energy in a supernova explosion. ...

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• Strong Gravity in the Vicinity of Supermassive Black Holes - by Eamon Scullion,
• Astrodynamics 101
• Armagh Observatory

... How much brighter is the Sun as viewed from the planet Mercury as compared to Earth ? ... Actually, all of these questions can be answered through a very simple mathematical relationship known as the inverse square law. ... As the distance from the Sun increases the surface area of the sphere grows by the square of the distance. ... Common sense tells us that the Sun will be brighter and the inverse square law tells us how much brighter. ... gr = 0.912 G or 91.2% gravity felt at Earth's surface. ...

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• Magellan Mission to Venus
• Virgo Group - Gravitational Wave basics
• What's New

... Two years ago, the Clementine space probe snatched this picture of the Moon as lit not by direct sunlight, but by reflected sunlight from Earth. ... Out With the Tide . ... Tides occur because the gravitational force between two bodies decreases with distance. ... The imbalanced gravitational pull of the Moon causes the oceans to be slightly non-spherical, creating two high tides and two low tides. ... In return, the Moon exerts a gravitational force on the high tide, causing Earth to rotate slower....

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• ASP: Classroom Activity: Playground Physics
• ASP: Up, Up, and Away
• ASP: Family ASTRO for Families and Friends: Getting Involved and Frequently

... Great oppositions. ... Proxima Centauri. ... Scientists proved that the problem of preserving the Earth's climate and the annual change of seasons can be solved by a small star, negligible mass, but similar to a main-sequence star, moving in a circular orbit around the Sun. ... Sombrero Galaxy. The Sombrero Galaxy, M104, is known as a holder of one of supermassive black holes. ... Roughly estimate the approximate mass of the supermassive black hole in the center of M104 (answer in solar masses m). ...

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... A Blue Moon Halo over Antarctica . ... HCG 87: A Small Group of Galaxies . ... By planet Earth's calendar, the Curiosity Mars Rover reached its 3rd anniversary on the surface of the Red Planet on August 6. ... Full Earth, Full Moon . ... But on that date a million miles away, the Deep Space Climate Observatory (DSCOVR) spacecraft's Earth Polychromatic Imaging Camera (EPIC) captured this view of an apparently Full Moon crossing in front of a Full Earth. ... Virgo Cluster Galaxies . ... August . ...

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• Neptune: Once Around
• Астронет > Neptune: Once Around

otherwise stated, constants are denoted by the following symbols and may be taken to have the values below Elementary charge Speed of light in vacuum Planck constant Permeability of vacuum Permittivity of vacuum Unified atomic mass constant Rest mass of proton Rest mass of electron Boltzmann constant Avogadro constant Gravitational ... A pulse of light of frequency f is emitted from the space station towards the ship at exactly the time the ship passes the Earth in the Earth frame. ...

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• http://www.mrao.cam.ac.uk/~kjbg1/exams/2008_paper.pdf
• Astrophysics Group VSA
• Astrophysics Group Research and Instrumentation

Blackholes Forum Message . ... Good Question. ... We really don?t know what causes gravity ( mass properties ) only how it works in the present universe state. ... It may be that you have just proven your assumption is wrong and gravity/mass properties do depend on the present universe state to exist. ... www.astronomy.net . About Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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• A Question Of Atmosphere On Our Moon!? - an Astronomy Net God Science Forum
• Question Answered - an Astronomy Net UFO Forum Message
• Speed Of Gravity - an Astronomy Net Gravity Forum Message

... --------------- SLY = (Vampire looking guy, high collar, grey backdrop) ------------------------------------------------------- Avg Elims /year : 5.29 Favorite veapons: S B Delta Max-1 Home : Moon Base Alpha Best Track : Chicago Car : Night Stalker Favorite Food : Smokey Links MOTOR MANIAC = (Negro guy with brace over nose, blue backdrop) -------------------------------------------------------------- Avg Elims /year : 6.42 ...

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• http://crydee.sai.msu.ru/ftproot/pub/rec/music/lyrics/cs-uwp/m/moody.blues/question
• http://crydee.sai.msu.ru/ftproot/pub/rec/music/lyrics/cs-uwp/folk/a/all_around_my_hat
• http://crydee.sai.msu.ru/ftproot/pub/rec/music/lyrics/cs-uwp/m/meat.puppets/monsters

... Please find below the final programme of the workshop. Each regular talk will be 20 minutes long plus another 10 minutes for questions and discussion at the end. On Friday there will be a pizza lunch combined with an informal discussion session kindly facilitated by John Dickey and Felix J. Lockman. ... Coffee . ... Magnetic Fields in the Thick Disk of the Milky Way . ... Highly Ionized Plasma in High-Velocity Clouds . ... Limits on the Hot Diffuse Galactic Halo . ... John Dickey . ...

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• Research Interests
• Research - Compact high-velocity clouds around the Milky Way
• The Puzzle

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2011 July 14 . Neptune: Once Around . Credit: NASA , ESA , Hubble Heritage Team ( STScI / AURA ) . Explanation: Neptune rotates once on its axis in about 16 hours. ... Because Neptune's axis of rotation is tilted to its orbital plane by 29 degrees, compared to Earth's 23.5 degrees, Neptune experiences seasons analogous to Earth's . ...

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• APOD: 2015 August 11 - A Blue Moon Halo over Antarctica
• APOD: June 23, 1995 - Gamma Ray Sky Map
• APOD: January 4, 1999 - Ring Around the Cluster

... Star Atlas . ... Gaseous ring around young star raises questions . ... Astronomers have detected a mysterious ring of carbon monoxide gas around the young star V1052 Cen, which is about 700 light-years away in the southern constellation Centaurus. ... This new finding raises more questions than it answers about the late stages of star and solar system formation. т??Why do turbulent motions not tear the ring apart?т?? ... Only registered members of Astronomy.com are allowed to comment on this article...

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• Dark energy and the accelerating universe | Astronomy.com
• Tracking the origins of speedy space particles | Astronomy.com
• Astronomers discover star racing around black hole at center of our galaxy |

... 8, ``Celestial Mechanics'', 2002 Precession and free core nutation of neutron stars A. Gusev, I. Kitiashvili Kazan University, Russia In 1992 Wolszczan and Frail discovered a planetary system around the pulsar PSR 1257+12 [1]. ... Third case: the most likely possibility is the free precession of the pulsar with a rigid 81 neutron star. ... It is known that rotation of the terrestrial planets having rigid mantle and elliptical liquid core is characterized by Free Core Nutation (FCN). ...

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