Extragalactic planet: Difference between revisions
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Revision as of 05:11, 3 September 2009
An extragalactic exoplanet is a planet outside the Solar System that is also outside the Milky Way Galaxy. An extragalactic planet[1] is an planet that is outside the Milky Way Galaxy. Another term used to describe these is extragalactic extrasolar planet.
A microlensing event in the Twin Quasar gravitational lensing system, Huchra's Lens, was observed in 1996, by R. E. Schild, in the "A" lobe of the lensed quasar. It is predicted that a 3-Earth mass planet in the lensing galaxy, YGKOW G1, caused the event. This was the first extragalactic planet announced. This however is not a repeatable observation, as it is a one time chance alignment. This predicted planet lies 4 billion light years away. [2][3]
Andromeda Galaxy planets
A team of scientists has used gravitational microlensing to come up with a tentative detection of an extragalactic exoplanet in Andromeda, our nearest large galactic neighbour. The lensing pattern fits a star with a smaller companion weighing just 6 or 7 times the mass of Jupiter. This suspected planet is the first announced in the Andromeda Galaxy. [4][5]
References
- ^ Extrasolar Visions, "Extragalactic Worlds" (accessed 1 September 2009)
- ^ New Scientist (issue 2037), Do alien worlds throng faraway galaxy? Govert Schilling 06 July 1996
- ^ Extrasolar Visions, "The Q0957+561 Planet" (accessed 1 September 2009)
- ^ Thaindian News, First extragalactic exoplanet may have been found by gravitational microlensing, 11 June 2009
- ^ New Scientist, First extragalactic exoplanet may have been found, 10 June 2009
See also
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