[{WikipediaArticle oldid='222777171'}]



[{VerifyArticle user='eertl' template='Standard' date='01. November 2014' page-date='2014' comment='Überprüft, nach Sexl, Physik 6; Dobrinski, P., Krakau, G., Vogel, A., Physik für Ingenieure; bis auf die Kapitek "Allgemeine Relativitätstheorie" und "Gravitation und Quantentheorie"' funder='66' }]
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| What's large and blue and can wrap itself around an entire galaxy? A gravitational lens mirage. Pictured above, the gravity of a luminous red galaxy (LRG) has gravitationally distorted the light from a much more distant blue galaxy. More typically, such light bending results in two discernible images of the distant galaxy, but here the lens alignment is so precise that the background galaxy is distorted into a horseshoe -- a nearly complete ring. Since such a lensing effect was generally predicted in some detail by Albert Einstein over 70 years ago, rings like this are now known as Einstein Rings. Although LRG 3-757 was discovered in 2007 in data from the Sloan Digital Sky Survey (SDSS), the image shown above is a follow-up observation taken with the Hubble Space Telescope's Wide Field Camera 3. Strong gravitational lenses like LRG 3-757 are more than oddities -- their multiple properties allow astronomers to determine the mass and dark matter content of the foreground galaxy lenses. ( citation from APOD )| Lensshoe_hubble.jpg| Lensshoe_hubble.jpg : ESA/Hubble & NASA derivative work: Bulwersator ( talk )| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:A Horseshoe Einstein Ring from Hubble.JPG
| David Randolph Scott, Commander der Mondmission Apollo 15 (1971), demonstriert anhand einer Feder und eines Hammers, die er im luftleeren Raum auf dem Mond fallen lässt, dass alle Körper unabhängig von ihrer Masse gleich schnell fallen.| https://nssdc.gsfc.nasa.gov/planetary/lunar/apollo_15_feather_drop.html| NASA| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Apollo 15 feather and hammer drop.ogv
| "Newtons Apfel krümmt die Raumzeit." William Stukeley (1687-1765) berichtet, Newton sei auf die Gravitation durch einen herabfallenden Apfel gekommen| Eigenes Werk| Roderich Kahn| [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 4.0' align='center' link='https://www.austria-forum.org/cc/by-sa-40.html' target='_blank'}]| Datei:Apple of Newton.jpg
| The Wikimedia Commons logo, SVG version.| Original created by Reidab ( PNG version ) SVG version was created by Grunt and cleaned up by 3247 . Re-creation with SVG geometry features by Pumbaa , using a proper partial circle and SVG geometry features. (Former versions used to be slightly warped.)| Reidab , Grunt , 3247 , Pumbaa| [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 3.0' align='center' link='https://www.austria-forum.org/cc/by-sa-30.html' target='_blank'}]| Datei:Commons-logo.svg
| Begriffsklärungs-Icon (Autor: Stephan Baum)| Eigenes Werk ( Originaltext: Own drawing by Stephan Baum ) Original Commons upload as File:Logo Begriffsklärung.png by Baumst on 2005-02-15| Stephan Baum| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Disambig-dark.svg
| Earth's Gravity according to the Preliminary Reference Earth Model (PREM). The acceleration has its maximum at 3480 km and a value of 10.68 m/s² The other curves show: An approximated Earth, where the density decreases linearly from center to surface. In this model, the density at the center is the same as in the PREM, but the surface density is chosen in such a way that the mass of the resulting sphere equals the mass of the Earth. An idealized Earth with constant density (naturally, Earth's average density was used for this).| Dziewonski, A.M. (1981). "Preliminary reference Earth model". Physics of the Earth and Planetary Interiors 25 : 297–356. http://geophysics.ou.edu/solid_earth/prem.html AllenMcC. , File:EarthGravityPREM.jpg for the linear density curve| Con-struct| [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 3.0' align='center' link='https://www.austria-forum.org/cc/by-sa-30.html' target='_blank'}]| Datei:EarthGravityPREM.svg
| NGC 5257/8 (Arp 240) is an astonishing galaxy pair, composed of spiral galaxies of similar mass and size, NGC 5257 and NGC 5258. The galaxies are visibly interacting with each other via a bridge of dim stars connecting the two galaxies, almost like two dancers holding hands while performing a pirouette. Both galaxies harbor supermassive black holes in their centers and are actively forming new stars in their disks. Arp 240 is located in the constellation Virgo, approximately 300 million light-years away, and is the 240th galaxy in Arp's Atlas of Peculiar Galaxies. With the exception of a few foreground stars from our own Milky Way all the objects in this image are galaxies. This image is part of a large collection of 59 images of merging galaxies taken by the Hubble Space Telescope and released on the occasion of its 18th anniversary on 24th April 2008. About the object Object name NGC 5257, NGC 5257/8, Arp 240, VV 055, KPG 389 Object description Interacting Galaxies Position (J2000) 13 39 55.68 +00 50 03.9 Constellation Virgo Distance 300 million light-years (100 million parsecs) About the data Data description The Hubble image was created using HST data from proposal 10592: A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University) Instrument ACS/WFC Exposure date(s) December 20, 2001 Exposure time 33 minutes Filters F435W (B) and F814W (I)| http://hubblesite.org/newscenter/archive/releases/2008/16/image/bu/ ( direct link )| NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University)| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Hubble Interacting Galaxy NGC 5257 (2008-04-24).jpg
| This diagram describes the mechanisms of Newton's law of universal gravitation;  A point mass m 1 attracts another point mass m 2 by a force F 2 pointing along the line intersecting both points. The force is proportional to the product of the two masses and inversely proportional to the square of the distance ( r ) between the point masses. Regardless of masses or distance, the magnitudes of the two forces,  F 1  and  F 2  (absolute values), will always be equal. G is the gravitational constant; G ≈ 6.67428(67)×10 −11 m 3 /(kg·s 2 ).| Eigenes Werk ( Originaltext: Self-made by User:Dna-Dennis )| User:Dna-Dennis| [{Image src='https://www.austria-forum.org/cc/images/slim/by.png' alt='CC BY 3.0' align='center' link='https://www.austria-forum.org/cc/by-30.html' target='_blank'}]| Datei:NewtonsLawOfUniversalGravitation.svg
| Parabolic trajectory of water. This fountain's water describes nearly a parabola (in fact, it is an ellipse- gravity is, at the earth surface, nearly constant.). Hercules fountain at Island's garden, Royal palace, Aranjuez, Madrid, Spain| Eigenes Werk| GuidoB| [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 3.0' align='center' link='https://www.austria-forum.org/cc/by-sa-30.html' target='_blank'}]| Datei:ParabolicWaterTrajectory.jpg
| Das Weltall wird als ein flaches Raster dargestellt. Erde, Mond und Sonne dellen dieses Raster aufgrund ihrer Masse ein. Alle Himmelskörper müssen sich dann entlang der Vertiefungen bewegen. Ihre Fliehkraft wirkt jedoch dagegen.| https://www.zdf.de/dokumentation/terra-x/schwerkraft-als-kruemmung-des-raumes-creative-commons-clip-100.html https://rodlzdf-a.akamaihd.net/none/zdf/20/05/200511_191_55100705_Schwerkraft_als_Kruemmung_des_Raumes_CC_tex/1/200511_191_55100705_Schwerkraft_als_Kruemmung_des_Raumes_CC_tex_3360k_p36v15.mp4 Source of the original documentary/URL zur vollständigen Doku: https://www.zdf.de/dokumentation/terra-x/faszination-universum-die-schwerkraft-der-dirigent-der-welt-100.html| ZDF/Terra X/ T. Schultes/ Nikolai Holzach| [{Image src='https://www.austria-forum.org/cc/images/slim/by.png' alt='CC BY 4.0' align='center' link='https://www.austria-forum.org/cc/by-40.html' target='_blank'}]| Datei:Schwerkraft als Krümmung des Raumes (CC BY 4.0).webm
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