From the Proceedings of the National Academy of Sciences Volume 15 : March 15, 1929 : Number 3 A RELATION BETWEEN DISTANCE AND RADIAL VELOCITY AMONG EXTRA-GALACTIC NEBULAE By Edwin Hubble Mount Wilson Observatory, Carnegie Institution of Washington Communicated January 17, 1929 Determinations of the motion of the sun with respect to the extra-galactic nebulae have involved a term of several hundred kilometers which appears to be variable. Explanations of this paradox have been sought in ...

Previous Story / Next Story / January - June 1999 Archive Phys. Rev. 7, 355 (issue of March 1916) 22 April 1999 Title and Authors Centennial Focus: Millikan's Measurement of Planck's Constant AIP Meggers Gallery of Nobel Laurestes Robert A. Millikan Millikan in 1923 at age 55. In honor of the American Physical Society's centennial year, Physical Review Focus is publishing occasional stories describing important research published in the Physical Re ...

Determining Fundamental Cosmological Parameters At multipoles , the CMB anisotropies become sensitive to fundamental cosmological parameters, such as the spatial curvature of the Universe, the baryon density and the Hubble constant. Some specific examples have been shown in Figure 1.4. With the high sensitivity, angular resolution and large sky coverage afforded by PLANCK it is possible, with certain general assumptions, to determine these fundamental parameters to a precision of a few perce ...

CSIRO / Sunday January 31, 1999 Hubble Constant revised yet again An international team led by a young Australian scientist has used CSIRO's Australia Telescope to measure how fast the Universe is expanding—and found it to be both older and larger than previously thought. The expansion is measured as a number called the Hubble Constant. It is used to calculate how big and how old the Universe is. The observing team used a new method that avoids the built-in uncertainties in older meth ...

Finding the Radius of the earth. Basic Idea: We'll use the north star (polaris) to give us information about the radius of the earth. Later, we'll use measurements recorded by various people, along with some statistical tools, to estimate the radius of the earth. Since the north star sits over the north pole, and is very far from the earth, it appears to be high in the sky if you are near the north pole, and low in the sky if you are near the equator. If you're in the southern he ...

Modern PhysicsQuantum PhysicsQuantum Field TheoryGeneral Quantum Field Theory Units and Dimensional AnalysisDimensionless Parameters Physics ContributorsPlouffe Fine Structure Constant A dimensionless number that appears in the analysis of quantum electrodynamical Feynman diagrams. It is not currently known if it can be derived from first principals in terms of mathematical constants, but it can be determined as a conglomeration of th ...

Faraday's Constant Using Faraday's constant to solve problems regarding the process of electrolysis. You may find the section on current in the physics tutorial helpful. Redox reactions have many important uses. One of these is electrolysis, the conversion of electrical energy to chemical energy. Do you remember this table? (From the electrodes segment) AnodeOxidation CathodeReduction In electrolysis, oxidation still occurs at the anode, and reduction still occurs at the cathode, b ...

Homepage · The Institute · ChemNet · Chemistry Information · Internet · Index · User Pages · FUNDAMENTAL PHYSICAL CONSTANTS Version of this page using math mode (you need a browser such as Arena!) PostScript Version (without warranty) Planck constant h 6.6260755·10-34 J·s h / (2 ) = 1.05457266·10-34 J·s Boltzmann constant kB 1.380658·10-23 J/K ( = 8.617385·10-5 eV/K ) Elementary charge e 1.60217733·10-19 C Avogadro number NA 6.0221367·1023 particles/mol ...

Information at the foundation of modern science and technology from the Physics Laboratory of NIST CODATA Internationally recommended values of the Constants Topics: Values Energy Equivalents Searchable Bibliography Background Constants Bibliography Constants, Units & Uncertainty home page Latest (2002) values of the constantsVersion history and disclaimer (e.g., electron mass, most misspellings okay) Searchfor value by name Display alphabeti ...

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What's New Site Map NASA Homepage Search: HOMEScienceSpecial ExhibitSatellites and DataTeachers' Corner Ask an AstrophysicistDictionaryResourcesFeedback Imagine Home | Ask an Astrophysicist | Current page The Question (Submitted October 19, 1997) I've been trying to figure out exactly what the Hubble Constant is for quite a while. I know that it has to do with the expansion rate of the Universe and that it can also directly yield the distance scale and t ...

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MICROWAVE ANISOTROPY PROBE The page you have requested has moved. If you are not directed automatically to the new page (likely, if you are reading this message), use the this link to go there: http://map.gsfc.nasa.gov/m_uni.html

Physical Constants Do NOT Exist by Guy Myhre This brief is a nonmathematical description of some of my discoveries, which pertain to the methodology of quantum physics. If, after reading it, you want to delve into detailed mathematical proof of these and other discoveries, please examine my book, Our Unitary Universe. | WritWord Homepage | If They Are Not Physical Constants, What Are They? Most of the physical constants really do NOT exist. This recently discovered fact forev ...

ESO OUTREACHHOMEINDEXHELPNEWSSEARCHGO! ESO OUTREACH PRESS RELEASES 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 Information from the European Southern Observatory ESO Press Release 09/95 17 August 1995 For immediate release Beyond the Hubble Constant International Astronomer Team Witnesses Very Ancient Stellar Explosion A few months ago, a violent stellar explosion -- a supernova -- was discov ...

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Scientists Find the True Hubble Constant! News story originally written on May 26, 1999 Hubble Space Telescope image of spiral galaxy NGC 4603. It is the most distant galaxy with Cepheids used to measure the Hubble Constant. Click on image for full size ( 26K JPG ) Courtesy of NASA After eight long years, the Hubble Space Telescope Key Project Team finally revealed what they believe is the real Hubble Constant. The Hubble Constant is the speed which the Universe is expanding at. Fo ...

The Controversy over Newton's Gravitational Constant In 1686 Isaac Newton realized that the motion of the planets and the moon as well as that of a falling apple could be explained by his Law of Universal Gravitation, which states that any two objects attract each other with a force equal to the product of their masses divided by the square of their separation times a constant of proportionality. Newton estimated this constant of proportionality, called G, perhaps from the gravitational acceler ...

The Controversy over Newton's Gravitational Constant In 1686 Isaac Newton realized that the motion of the planets and the moon as well as that of a falling apple could be explained by his Law of Universal Gravitation, which states that any two objects attract each other with a force equal to the product of their masses divided by the square of their separation times a constant of proportionality. Newton estimated this constant of proportionality, called G, perhaps from the gravitational acceler ...

The Speed of Light - A Limit on Principle? This web page has moved to a new address. Please update your links. http://home.sunrise.ch/schatzer/space-time.html Automatically being redirected within a few seconds... (if not, please click on the URL above)

Theoretical speculations on the Hubble constant and implications of the CMB observations (giving the same value...) Alain Blanchard1 and Marian Douspis1 1 Observatoire astronomique de Strasbourg Introduction A Theoretical Perspective What does the CMB tell us? Likelihood Estimate of the Hubble constant Conclusion How Far Can You Go ? Proceedings of a workshop organized by the Observatoire de Strasbourg La Petite Pierre (Northern Vosges), 25-27 June 1997

Not a member yet? Get Free Membership Username: Password: Remember me Forgot your login? Ask the Experts Physics Job Board University Departments Einstein eGreetings Science eStore Question What is the fine-structure constant? Asked by: Joshua Johnson Answer The fine-structure constant is a unitless numerical constant - whose value is ...

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AAS Meeting #193 - Austin, Texas, January 1999 Session 94. Invited Talks: Perlmutter and Kirshner Invited, Friday, January 8, 1999, 3:40-5:10pm, Ballroom A [Previous] | [Session 94] | [Next] [94.02] Measuring Cosmological Parameters with High Redshift Supernovae R. P. Kirshner (Harvard-Smithsonian CfA) The High-Z Supernova Search Team is an international collaboration formed to measure the deceleration and global geometry of the Universe using Type Ia supernovae. Our group is a co ...