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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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Astronauts dock at International Space Station
Space & Earth / Space Exploration
15 hours ago |
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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'
16 hours ago |
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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.
Studying how black holes grow
Space & Earth / Space Exploration
Dec 17, 2009 |
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Black holes are some of the most exotic objects in the universe. They are the final evolutionary stage of giant stars much larger than the sun. When these stars explode, their cores collapse down to the size ...
Glint of Sunlight Confirms Liquid in Northern Lake District of Titan
Space & Earth / Space Exploration
Dec 17, 2009 |
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(PhysOrg.com) -- NASA's Cassini Spacecraft has captured the first flash of sunlight reflected off a lake on Saturn's moon Titan, confirming the presence of liquid on the part of the moon dotted with many large, ...
Hubble Finds Smallest Kuiper Belt Object Ever Seen
Space & Earth / Space Exploration
Dec 16, 2009 |
4.9 / 5 (20) |
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(PhysOrg.com) -- NASA's Hubble Space Telescope has discovered the smallest object ever seen in visible light in the Kuiper Belt, a vast ring of icy debris that is encircling the outer rim of the solar system ...
Giant Planet Set for a Cataclysmic Show
Dec 16, 2009 |
4.9 / 5 (16) |
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(PhysOrg.com) -- A team of Chinese astronomers have discovered a giant planet close to the exotic binary star system QS Virginis. Although dormant now, in the future the two stars will one day erupt in a violent ...
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