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Planet 'spotted' in Andromeda galaxy

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Comet
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« on: May 19, 2012, 08:16:11 pm »

Planet 'spotted' in Andromeda galaxy

Astronomers believe they may have discovered the first planet ever detected in another galaxy. The new world was apparently glimpsed in the closest giant spiral galaxy to the Milky Way, Messier 31 in the constellation of Andromeda. It lies an incredible 2.5 million light-years away - too far normally to be seen. But it revealed itself thanks to a phenomenon called microlensing where the gravitational field of an object closer to Earth acts like a magnifying glass.

June 14, 2009 | 2




Planet 'spotted' in Andromeda galaxy Planet 'spotted' in Andromeda galaxy Image:

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Astronomers believe they may have discovered the first planet ever detected in another galaxy. The new world was apparently glimpsed in the closest giant spiral galaxy to the Milky Way, Messier 31 in the constellation of Andromeda.

It lies an incredible 2.5 million light-years away - too far normally to be seen.

But it revealed itself thanks to a phenomenon called microlensing where the gravitational field of an object closer to Earth acts like a magnifying glass.

Amazingly, it has taken the astronomers five years to realise that they probably netted an extra-galactic planet. They observed a peculiar microlensing event while studying the Andromeda galaxy - which can be seen as a dim blur with the unaided eye - in 2004.

The international team, using the UK's Isaac Newton Telescope on the Canary Island of La Palma, thought at the time that they had recorded a pair of stars orbiting each other.

But computer simulations and other calculations have persuaded them that they actually observed a star with a smaller, planet sized companion about six times bigger than Jupiter.

More than 300 so-called exoplanets have been found orbiting other stars in our own galaxy. And NASA has launched a $595 million spaceprobe called Kepler to watch 100,000 stars for signs of world like Earth.

Picture: A photo of the galaxy M31 in visible light. (Photo: John Lanoue).

* Discover space for yourself and do fun science with a telescope. Here is Skymania's advice on how to choose a telescope. We also have a guide to the different types of telescope available.

©PAUL SUTHERLAND, Skymania.com
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Comet
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« Reply #1 on: May 19, 2012, 08:17:44 pm »

How many planets does Andromeda galaxy have?
In: Astronomy, Planetary Science, Galaxies [Edit categories]

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Answer:
At present there are 350 extrasolar planets. Most are contained in the Milky Way galaxy. They are primarily "gas giant" planets, but if our solar system is typical (the Law of Mediocrity would lead us to believe it is) there should be many more rocky planets like ours.

The extrasolar planets discovered in our neighbouring galaxy, Andromeda, are:

    Upsilon Andromeda b (AKA: HD69830 b)
    Upsilon Andromeda c (AKA: HD69830 c)
    Upsilon Andromeda d (AKA: HD69830 d)
    HD 8673 b


Again, if our galaxy is normal, then Andromeda would have planets around 10% of it's sun-like (G type) stars

Aside: The "Law of Mediocrity" states that you're nothing special. If you can do it, likely a lot of people can.

Update 2009:

Newest extra solar planets are Gliese 581 (the closest in size to Earth, only 1.9 times larger) and Gliese 581 (even larger), but it's sitting square in the habitable zone, where liquid water would be possible. Both Gliese 581 d and Gliese 581 e are located in constellation Libra and orbit around Gliese 581.

Read more: http://wiki.answers.com/Q/How_many_planets_does_Andromeda_galaxy_have#ixzz1vMtqIoQF


http://wiki.answers.com/Q/How_many_planets_does_Andromeda_galaxy_have
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