Lighting up the Universe
Light has yielded many insights into the universe over the years.
The prediction and observation of stars in the sky might not sound like much, but together, they make for one of the most famous tales of physics. Ever since the early 19th century, astronomers hypothesized that some things were so massive that even light would be sucked in by their gravitational pull! It wasn’t until 1919, when the British Royal Society and Royal Astronomical Society decided to fund an expedition to Principe that this was demonstrated. The images of the stars around the sun showed positions consistent with Einstein’s theory of general relativity, and not Newtonian physics.
If you’re interested in astronomy, see what the people at the stardome are up to!
Tilman Sauer, “A brief history of gravitational lensing”, Einstein Online, http://www.einstein-online.info/spotlights/grav_lensing_history, accessed 15/09/2014
Steven S. Shapiro, Irwin I. Shapiro, “Gravitational Deflection of Light”, Einstein Online, http://www.einstein-online.info/spotlights/light_deflection, accessed 15/09/2014
Leonidas Moustakas, Adam Bolton, “Einstein Rings: Nature’s Gravitational Lenses”, Hubble 2006 Science Year in Review, http://hubblesite.org/hubble_discoveries/science_year_in_review/pdf/2006/einstein_rings_natures_gravitational_lenses.pdf, accessed 15/09/2014
“Arthur Stanley Eddington” by George Grantham Bain Collection (Library of Congress) – Licensed under Public domain via Wikimedia Commons – http://commons.wikimedia.org/wiki/File:Arthur_Stanley_Eddington.jpg#mediaviewer/File:Arthur_Stanley_Eddington.jpg
“A Horseshoe Einstein Ring from Hubble” by Lensshoe_hubble.jpg: ESA/Hubble & NASAderivative work: Bulwersator (talk) – Lensshoe_hubble.jpg. Licensed under Public domain via Wikimedia Commons – http://commons.wikimedia.org/wiki/File:A_Horseshoe_Einstein_Ring_from_Hubble.JPG#mediaviewer/File:A_Horseshoe_Einstein_Ring_from_Hubble.JPG