... The expansion is measured as a number called the Hubble Constant . ... Our value is about 20% lower than the one got with the Hubble Space Telescope in 1994," said Dr Jim Lovell, leader of the team that made the measurement. The Hubble Constant is named after American astronomer Edwin Hubble, who in the 1920s found that other galaxies were moving away from ours. ... The Hubble Constant links the galaxy's distance with its speed." ... A short run-down on the Hubble Constant: . ...

Еще в разделе: (Показать все результаты (>8979) - www.atnf.csiro.au/ )

• ATNF Media Releases (1998)

The Moon orbits around the Earth. ... To keep the Moon moving in that circle--rather than wandering off--the Earth must exert a pull on the Moon, and Newton named that pulling force gravity . ... If it was the same force, then a connection would exist between the way objects fell and the motion of the Moon around Earth, that is, its distance and orbital period. ... Newton went further and proposed that gravity was a "universal" force, and that the Sun's gravity was what held planets in their orbits. ...

Еще в разделе: (Показать все результаты (>836) - www.iki.rssi.ru/ )

• Space Weather Dials Interpretation Guide
• Lagrangian Points
• The Earth's Magnetosphere

Lesson Plan #30 http://www.phy6.org/stargaze/Lgravity.htm . This lesson re-derives Newton's result, that if the force of gravity decreases like the square of the distance from the center of attraction, the same force that causes objects on the Earth"s surface to fall can also be responsible for the motion of the Moon. ... This lesson plan supplements: "Newton's Theory of Universal Gravitation," section #20 http://www.phy6.org/stargaze/Sgravity.htm . ... Starting the lesson: . ...

Еще в разделе: (Показать все результаты (>1929) - www.cosmos.ru/ )

• Newton's theory of "Universal Gravitation"
• FAQ: "Exploration of the Earth's Magnetosphere"
• The Exploration of the Earth's Magnetosphere"

Astronomy Terms - To Help You Study The Universe . Articles | ... Learning about the universe, or the study of astronomy, can be fun for the individual or for the whole family. ... Learning a few simple terms will help you with this fascinating study. ... You will use a telescope or binoculars for your observation of the sky at night. ... Celestial Terms . ... Meteor or a shooting star ? the light caused when a meteoroid burns up in Earth's . ... www.astronomy.net . About Astronomy Net | ...

Еще в разделе: (Показать все результаты (>346) - www.astronomy.net/ )

• Magnification (Power) And Using Eyepieces - an Astronomy Net Article

The ESA/ESO Astronomy Exercise Series 2 . The Distance to Messier 100 as Determined by Cepheid Variable Stars . ... The small variations in distance to the individual Cepheid variable stars in the Cloud are negligible compared with the much larger distance to the SMC. ... In this way Cepheid variable stars can be used as one of the 'standard candles' in the Universe that act either as distance indicators themselves or can be used to calibrate (or set the zero point for) other distance indicators. ...

Еще в разделе: (Показать все результаты (>697) - www.astrosociety.org/ )

In order to measure the density of the Universe, it is necessary to sample a region that is larger than the scale on which the Universe becomes approximately homogeneous. ... When applied to clusters of galaxies we find a mass to luminosity ratio that implies a density of the Universe that is about 0.3 times the critical density. ... Thus the mass-to-muinosity ratio appears to vary with the size of the region measured, from 3 in the solar neighborhood to 30 in galaxies to 300 in clusters of galaxies. ...

Еще в разделе: (Показать все результаты (>1176) - www.sao.ru/ )

• Determine H0 using a SQL query to LEDA
• Details of the radio power calculation
• Details of the luminosity calculation

Problem Set 2 - CosmologyґA3002 ґDue on or before November 7th. Can be sent via internal mail (Brian Schmidt, RSAA) use H0=70 km/s/Mpc, M=0.27, =0.73, w=-1 for all problems. ... Finish off your Monte Carlo simulation by selecting objects at random redshifts from 0<z<0.1, assuming that they have a mean absolute magnitude of M=-19.5 with a dispersion 0.2 magnitudes. ... Problem 2.1 (2 pt): In class we described the scale at which material can collapse in the Universe as the Jeans' length. ...

Еще в разделе: (Показать все результаты (>577) - www.mso.anu.edu.au/ )

• The High-Z SN Search Description
• Pink Black Holes: Frequently Asked Questions
• Untitled1

... 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 . ...

Еще в разделе: (Показать все результаты (>92114) - www.astronet.ru/ )

• Астронет > GRACE Maps the Gravity of Earth
• Journal "Peremennye Zvezdy"
• XWare > APOD

where 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 ... Two space craft are travelling in opposite directions towards each other, one at speed u and the other at speed v with respect to the Earth. ...

Еще в разделе: (Показать все результаты (>2661) - www.mrao.cam.ac.uk/ )

• http://www.mrao.cam.ac.uk/~kjbg1/lectures/lect1_1.pdf
• http://www.mrao.cam.ac.uk/~kjbg1/exams/2007_paper.pdf
• http://www.mrao.cam.ac.uk/~kjbg1/exams/2008_paper.pdf

... 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. ...

Еще в разделе: (Показать все результаты (>8720) - www.arcetri.astro.it/ )

• Virgo Group - Gravitational Wave basics
• The Planet Jupiter
• Mariner 10

... 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 | ...

Еще в разделе: (Показать все результаты (>3579) - www.sai.msu.su/ )

• APOD: 2011 May 10 - Gravity Probe B Confirms the Existence of Gravitomagnetism
• APOD: 2000 October 19 - The Farthest Explosion Yet Measured
• APOD: May 27, 1999 - NGC 4603 and the Expanding Universe

... 8, ``Celestial Mechanics'', 2002 High--accuracy modelling of the Earth's gravitational potential from GOCE satellite gradiometry mission M. S. Petrovskaya, A. N. Vershkov Pulkovo Observatory, St. Petersburg, Russia The Earth's gravitational potential is presented in form of a spherical harmonґ ic series with the coefficients C n;m which are the fundamental dynamical constants for the Earth. The set of C n;m for degree 0 ? n ? N and order jmj ? n constiґ tutes a geopotential model. ...

Еще в разделе: (Показать все результаты (>580) - www.ipa.nw.ru/ )

• AY2016 (contents)
• AY2012 (contents)
• AY2011 (contents)

... History ------- 04 Aug 2001 v0.90 more reorganisation. Hopefully CPAN-friendly now more tests (thanks Brad) 02 Aug 2001 v0.84 minor reorganisation, no change to code or docs 01 Aug 2001 v0.83 added version method, renamed string to stringify further documentation improvements improvements to test suite (thanks Brad) 29 Jul 2001 v0.82 added STERADIAN to constants improved documentation 28 Jul 2001 v0.81 renamed to Astro :: Cosmology removed need for PDL :: Astro :: Constants 19 Jul ...

Еще в разделе: (Показать все результаты (>1860) - hea-www.harvard.edu/ )

• Doug Burke's PDL page
• Astro::Cosmology - calculate cosmological distances, volumes, and times
• The AstroStat Slog Blog Archive Differential Emission Measure [Eqn]

Science Opportunities and Future Radio Telescopes: II. ... How is the Dark Matter halo distributed? ... Measure 3-D locations and motions; Model dark matter halos N-body integrations yield history/ future Dark Matter in Local Group full DM halos 50% DM halo N-body calculations: sensitive to dark matter halos Science with Current and Future National Radio Telescopes Constraints on radio observations Science with Current and Future Radio ...

Еще в разделе: (Показать все результаты (>3255) - www.naic.edu/ )

• Cosmology / Relativity / Gravity Wave Astronomy
• azencRackGearRunout
• accurange 3000 distomat

The database contains references to the papers, data files and links to the Internet resources related to measurements and calculations of the optical constants in the wavelength interval from X-rays to radio domain. ... References to some useful books and reviews on the subject (e.g. the classical handbooks edited by E.D.Palik) and links to Internet collections of optical constants and personal WWW pages with related software were also placed in the database. You have arrived at our welcome page. ...

Еще в разделе: (Показать все результаты (>407) - www.astro.spbu.ru/ )

• Optical constant database - Level: measurement/paper
• Polarization properties (transmitted radiation)
• Database of Optical Constants -- Misc: SVM code(s)

... This transit allows for the angular size of the dark spot (i.e. Venus) to be measured in a way that is more accurate than other ways. ... Calculate the distance to the Sun by assuming that the Earth and Venus have the same physical diameter (i.e. 12,600 km). ... The solar constant, the amount of energy that is received by the earth at the top of our atmosphere is 1.4 x 10 6 ergs cm -2 sec -1 , Calculate the total luminosity of the sun (you should get 4x10 33 ergs/sec). ...

Еще в разделе: (Показать все результаты (>406) - zebu.uoregon.edu/ )

• Historical Cosmologies
• THE HUBBLE LAW JAVA APPLET
• Astronomy HyperText Book: Planetary Motion

Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... The algorithm and appropriate program for decametric radiosignal propagation conditions prediction for paths from 500 to 9000 km have been developed at ISTP SB on the basis of normal wave method (AltyntsevaB.I,Iliyin N.V., Kurkin V.I. and others //Decameters channel simulation on the base of normal wave method . ... Solar activity indices are chosen automatically from the prediction date from the database . ...

Еще в разделе: (Показать все результаты (>31) - rp.iszf.irk.ru/ )

• East Siberian Center for the Earth's Ionosphere Research. Modelling, secondary
• East Siberian Center for the Earth's Ionosphere Research. Capabilities and
• East Siberian Center for the Earth's Ionosphere Research. Specific character

... Astronomy for Kids . ... May 2016: Gravitational waves breakthrough . ... Gravitational constant appears universally constant, pulsar study suggests . The fact that scientists can see gravity perform the same in our solar system as it does in a distant star system helps confirm that the gravitational constant truly is universal. ... Gravity, one of the four fundamental forces of nature, appears reassuringly constant across the universe, according to a decades-long study of a distant pulsar. ...

Еще в разделе: (Показать все результаты (>6186) - www.astronomy.com/ )

• т??Eye of Sauronт?? provides new way of measuring distances to galaxies |
• How do astronomers use Cepheid variables to measure distances? | Astronomy.com
• NASA's infrared observatory measures expansion of universe | Astronomy.com

... Continuous Wavelet Transform in Quantum Field Theory: An application to the Casimir effect . ... Nuclear structure effects in light muonic atoms . A.A. Dzyuba on behalf of the LHCb collaboration . Overview of LHCb results . ... Korzinin, S.G. Karshenboim . The relativistic two-loop electronic-vacuum-polarization contributions to Lamb shift in muonic hydrogen . ... Problems in determination of the Planck constant and redefinition of the SI units in terms of fundamental constants . ...

Еще в разделе: (Показать все результаты (>311) - www.gao.spb.ru/ )

• http://www.gao.spb.ru/russian/psas/ffk2013/talkfiles.html
• http://www.gao.spb.ru/english/as/j2014/presentations/titov.pdf
• http://www.gao.spb.ru/russian/psas/ffk2013/part.html

... After all we cannot send a probe to the star Altair to confirm that it is 17 light years away. ... The "Bessel determined that the star 61 Cygni was about ten light years away" Earth goes around the Sun in one year, so in six month it is in the opposite position in its orbit. ... In 1838 Bessel determined that the star 61 Cygni had a parallax of 0.314 arcseconds and therefore the star was about ten light years away (today the distance is more precisely measured to be 11.4 light years). ...

Еще в разделе: (Показать все результаты (>2093) - www.armaghplanet.com/ )

• http://www.armaghplanet.com/pdf/AstroTopics/Measuring%20the%20Universe/cepheid.pdf
• http://www.armaghplanet.com/pdf/AstroTopics/Stars%20and%20Constellations/The%20size%20of%20Space.pdf