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Kizzume
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 Posted: Mon Apr 07, 2008 4:50 pm Post subject: Solar System's 'look-alike' found |
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http://news.bbc.co.uk/1/hi/sci/tech/7333155.stm
| Quote: | By Paul Rincon
Science reporter, BBC News, Belfast
Almost 300 planets have now been found outside our Solar System
Astronomers have discovered a planetary system orbiting a distant star which looks much like our own.
They found two planets that were close matches for Jupiter and Saturn orbiting a star about half the size of our Sun.
Martin Dominik, from St Andrews University in the UK, said the finding suggested systems like our own could be much more common than we thought.
And he told a major meeting that astronomers were on the brink of finding many more of them.
The St Andrews researcher said this planetary system, and others like it, could host terrestrial planets like Earth. It was just a matter of time before such worlds were detected, he explained.
Dr Dominik told BBC News: "We found a system with two planets that take the roles of Jupiter and Saturn in our Solar System. These two planets have a similar mass ratio and similar orbital radius and a similar orbital period.
"It looks like this may have formed in a similar way to our Solar System. And if this is the case, it looks like [our] Solar System cannot be unique in the Universe. There should be other similar systems out there which could host terrestrial planets."
Dr Dominik presented his work at the Royal Astronomical Society's National Astronomy Meeting in Belfast.
Ultimate goal
The newfound planetary system, which orbits the star OGLE-2006-BLG-109L, is more compact than our own and is about five thousand light-years away.
Although nearly 300 extrasolar planets have been identified, astronomers have consistently failed to find planetary systems which resemble our own. Dr Dominik said only 10% of systems discovered so far are known to host more than one planet.
But he explained that all the techniques currently used to find exoplanets were strongly biased towards detecting gas giant planets orbiting at short distances from their parent stars.
The OGLE planets were found using a technique called gravitational micro-lensing, in which light from the faraway planets is bent and magnified by the gravity of a foreground object, in this case a another star.
"It's a kind of scaled-down version of our Solar System. The star the planets are orbiting is half as massive as the Sun and they orbit half as distant to their host star as Jupiter and Saturn orbit around the Sun," said Dr Dominik.
He said that the ultimate goal for exoplanet researchers was to find habitable Earth-like and Mars-like planets. This aim was achievable, he said, because technology was improving all the time.
"I think it will happen quite soon," he said, adding: "Micro-lensing can already go below Earth mass and it has detected more massive planets in the habitable zone. So in the next few years, we will see something really exciting."
Dr Dominik said there was competition between teams of astronomers using micro-lensing and those who favoured the transit technique, which seeks to detect new planets when, from our point of view, they pass directly in front of the parent star they are orbiting. The planet blocks a tiny fraction of the star's light, causing the star to periodically dim.
But he added that there was little chance to detect Earth-like worlds in OGLE-2006-BLG-109L because the system was too distant for current techniques to resolve planets the size of our own. |
This is fantastic news. I really don't know what to say about it at this time, but this is very cool to learn. 
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Hackfest
Joined: 04 Dec 2007
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| Posted: Wed Apr 09, 2008 2:14 am Post subject: |
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One of the things I don't like most about life is the fact that I won't get to see outside of my own brief period here. I'd love to see what these findings could potentially mean in 500 or 1,000 years. I really like technological advances, and often feel sorry that I won't get to see SO many of them. Especially at the rate they seem to be coming in our time. 
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Kizzume
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| Posted: Wed Apr 09, 2008 4:34 am Post subject: |
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I'm with you completely. You never know what could get discovered over our lifetimes though.
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jq
Joined: 02 Dec 2007
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| Posted: Wed Apr 09, 2008 8:07 pm Post subject: |
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| Kizzume wrote: | | I'm with you completely. You never know what could get discovered over our lifetimes though. |
It might seem slow since we're living day to day, but I have no doubt there will be ALL KINDS of technological advances in our life time. In fact, I don't look foward to it at all. It scares me more than anything.
But I will have to agree that space travel is freaking cool and I do wish we could figure out how to do THAT faster. If we discover aliens, I definitely hope it is within my lifetime, so long as they don't enslave mankind or something.
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Kizzume
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| Posted: Wed Apr 09, 2008 8:59 pm Post subject: |
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Are you primarily worried about the chip-ID kinds of things, the loss of privacy issues?
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Meow.
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jq
Joined: 02 Dec 2007
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| Posted: Fri Apr 11, 2008 9:15 am Post subject: |
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| Kizzume wrote: | | Are you primarily worried about the chip-ID kinds of things, the loss of privacy issues? |
Absolutely. Get ready to say goodbye to privacy in any way shape or form. Beyond privacy, I worry about the chip-IDs because I do believe in the possibility of an antiChrist figure, or at least a one world government that has complete power over everyone, and that scares me very, very much.
But outer space rules. And if we can find a new planet to migrate too-- or even better, for polluters to migrate to so we can have our earth back and maybe salvage it before the shit hits the fan-- that would be too cool.
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Kizzume
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| Posted: Fri Apr 11, 2008 11:53 am Post subject: |
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I have a feeling though that once we figure out how to migrate off the earth, the earth will be our dumpster, unfortunately. 
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Meow.
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jq
Joined: 02 Dec 2007
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| Posted: Fri Apr 11, 2008 3:13 pm Post subject: |
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| Kizzume wrote: | | I have a feeling though that once we figure out how to migrate off the earth, the earth will be our dumpster, unfortunately. |
It already is.
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Kizzume
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| Posted: Sun Apr 13, 2008 6:00 pm Post subject: |
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Not even close. We don't really know what polluted IS in contrast to what it COULD be. Just look at China:
[img]http://bastardlogic.files.wordpress.com/2007/06/073117_china_pollution_bej10541bebc510825.jpg[/img
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