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Orbit
hideIn physics, an orbit is the gravitationally curved path of one object around a point or another body, for example the gravitational orbit of a planet around a star.
Historically, the apparent motion of the planets were first understood in terms of epicycles, which are the sums of numerous circular motions. This predicted the path of the planets quite well, until Johannes Kepler was able to show that the motion of the planets were in fact elliptical motions.[citation needed] Isaac Newton was able to prove that this was equivalent to an inverse square, instantaneously propagating force he called gravitation.[citation needed] Albert Einstein later was able to show that gravity is due to curvature of space-time, and that orbits lie upon geodesics. This is the current understanding.
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News tagged with orbit
Final launch of Ariane 5 GS completes busy year
Space & Earth / Space Exploration
Dec 21, 2009 |
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(PhysOrg.com) -- Last week, an Ariane 5 GS launcher lifted off from Europe’s Spaceport in French Guiana on a journey to place the French military reconnaissance satellite Helios-2B into Sun-synchronous polar ...
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Iran to unveil new home-built satellite: report
Space & Earth / Space Exploration
Dec 24, 2009 |
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Iran will unveil a new home-built satellite in February, a newspaper reported Thursday, amid Western concerns that Tehran is using its nuclear and space industries to develop atomic and ballistic weapons.
Keck Telescopes Take Deeper Look at Planetary Nurseries
Dec 23, 2009 |
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(PhysOrg.com) -- Astronomers using the W. M. Keck Observatory have peered far into a young planetary system, giving an unprecedented view of dust and gas that might eventually form planets similar to Jupiter, ...
Astronauts dock at International Space Station
Space & Earth / Space Exploration
Dec 22, 2009 |
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A Russian rocket carrying three astronauts from Japan, Russia and the United States docked at the International Space Station Wednesday, the Russian flight control centre said.
Astronomers discover 'tilted planets'
Dec 22, 2009 |
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(PhysOrg.com) -- University of Exeter, UK, research has added to a growing evidence that several giant planets have orbits so tilted that their orbits can be perpendicular or even backwards relative to their ...
Astronauts blast off for Christmas space mission
Space & Earth / Space Exploration
Dec 20, 2009 |
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(AP) -- A Russian rocket blasted off from a cosmodrome in Kazakhstan lighting up the frigid Central Asian steppe Monday, shuttling an American, a Russian and a Japanese to the International Space Station.
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