April 30, 2014
Mohenjo
Science
amazon, Annular Eclipses, Annular Solar Eclipse, business, Business News, full moon, Hotels, human-rights, lunar eclipse, lunar eclipses, medicine, mental-health, research, Ring of Fire, Ring of Fire Eclipse, Ring of Fire Solar Eclipse, Science, Science News, Skywatching, solar eclipse, Solar Eclipse 2014, Solar Eclipses, Solar System, Space, Sun, technology, Technology News, travel, vacation, Watch Solar Eclipse
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The sun will look like a ring of fire above some remote parts of the world next Tuesday (April 29) during a solar eclipse, but most people around the world won’t get a chance to see it.
Whereas lunar eclipses occur only when there’s a full moon, and solar eclipses only happen during a new moon. Half the world saw a lunar eclipse during the full moon on April 15. When a lunar eclipse occurs, it usually means there is also a solar eclipse at the preceding or following new moon.
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The Moon’s orbit about the Earth is not perfectly circular, so that at different times the Moon can be slightly closer or further away than usual. This composite shot shows the progress of an annular eclipse in May 2013. | Jia Hao/The National Maritime Museum
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October 6, 2013
Mohenjo
Science
Albert Einstein, amazon, Astronomy, business, Business News, current-events, Curved Space-Time, Environment, Future, Gravitational Lensing, gravity, Hotels, huffingtonpost, Hui Liu, light rays, Mathematics, Microchips, path of light, Physics, research, Science, Science News, Slideshow, solar eclipse, Space, Space Time, Space-Time On Chip, Spacetime, technology, Technology News, theory of relativity, travel, vacation
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It took two major expeditions charting the solar eclipse of 1919 to verify Albert Einstein’s weird prediction about gravity — that it distorts the path of light waves around stars and other astronomical bodies, distorting objects in the background. Now, researchers have created the first precise analogue of that effect on a microchip.
Any large mass distorts the geometry of space around it, for instance making parallel light rays diverge or converge. One consequence, described by Einstein’s general theory of relativity, is that objects behind a body such as the Sun may look magnified or distorted as the optical path of light goes through the region of warped space.
Metamaterials scientist Hui Liu of Nanjing University in China and his colleagues mimicked this ‘gravitational lensing’ — which affects light in the vacuum of space — by making light travel through solid materials instead. Different transparent media have different indexes of refraction, causing light to bend. One example is at the interface between water and air, a familiar effect that makes a pencil look broken when it is half-dipped in water. But if a medium has an index of refraction that varies gradually rather than abruptly, it will make the the paths of light rays curve as they travel through it.
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The warping of the empty space around a massive star means that the shortest path of light around a star is a ‘curved’ one — but the bending of light rays in a medium can mimic the same effect. | Nature Photonics
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