HOW OUR SOLAR SYSTEM MAY BE VERY COMMON
Andrew Howard and Geoffrey Marcy, University of California Berkeley astronomers have observed for five years a series of 166 stars of class G and K ( similar to our Sun) that are located within 80 light years from Earth, in order to find extrasolar planets and classify them according to mass and orbital distance from their stars. The result of this research is that there could be planets like Earth in size or mass, around a star out of four.
"Of the roughly 100 stars like the Sun typically, one or two planets are Jupiter-sized, six have Neptune-like planets, and super-Earth about 12 people ranging from 3 to 10 Earth masses, "Howard said." If we consider the size of planets similar to Earth, including 1, 5 and 2 times the mass of the Earth, believe that you might find around about 23 100 stars.
"It 's the first estimate, based on current measurements, the fraction of stars that have planets similar to our size," says Marcy, referring to the fact that, until now, the research has mainly focused in finding out the distribution of planets similar to Jupiter and Saturn, but not by smaller bodies.
The research is based on relatively small distances between the planets and their stars, so it is reasonable supporre che possano esserci molti più pianeti Earth-like a distanze superiori, e probabilmente all'interno della fascia di Goldilocks, la zona abitabile di un sistema solare in cui l'acqua può esistere allo stato liquido.
Gli astronomi hanno utilizzato il telescopio di Keck, nelle Hawaii, uno strumento di 10 metri che è stato usato per misurare le variazioni di luce delle stelle osservate. Questa tecnica, allo stato attuale, consente di scoprire molto più facilmente oggetti dalle dimensioni imponenti che pianeti simili al nostro, come giganti gassosi o super-Earth da 15 a 30 volte la massa della Terra.
In totale si sono scoperti 33 pianeti attorno a 22 delle 166 stelle osservate. Il risultato è stato che circa il 12% of solar systems are super-Earth planets, from 3 to 10 Earth masses, but the prospect is that the percentage can go up to 23% over the next year, when the technology will allow us to more easily detect the presence of planets similar to ours.
According to Howard and Marcy, they used the telescope could detect from 120 to 260 planets "conceivably land" around 10,000 stars of class G and K. "One of the goals of astronomy is to find 'age-Earth', the fraction of stars like our sun have a planet like Earth. This is a first estimate and the actual figure is probably an eight, but one in four. But there is one in 100, which is a very positive news. "
From: DITADIFULMINE.COM
ANTIKITERA.NET
Andrew Howard and Geoffrey Marcy, University of California Berkeley astronomers have observed for five years a series of 166 stars of class G and K ( similar to our Sun) that are located within 80 light years from Earth, in order to find extrasolar planets and classify them according to mass and orbital distance from their stars. The result of this research is that there could be planets like Earth in size or mass, around a star out of four.
"Of the roughly 100 stars like the Sun typically, one or two planets are Jupiter-sized, six have Neptune-like planets, and super-Earth about 12 people ranging from 3 to 10 Earth masses, "Howard said." If we consider the size of planets similar to Earth, including 1, 5 and 2 times the mass of the Earth, believe that you might find around about 23 100 stars.
"It 's the first estimate, based on current measurements, the fraction of stars that have planets similar to our size," says Marcy, referring to the fact that, until now, the research has mainly focused in finding out the distribution of planets similar to Jupiter and Saturn, but not by smaller bodies.
The research is based on relatively small distances between the planets and their stars, so it is reasonable supporre che possano esserci molti più pianeti Earth-like a distanze superiori, e probabilmente all'interno della fascia di Goldilocks, la zona abitabile di un sistema solare in cui l'acqua può esistere allo stato liquido.
Gli astronomi hanno utilizzato il telescopio di Keck, nelle Hawaii, uno strumento di 10 metri che è stato usato per misurare le variazioni di luce delle stelle osservate. Questa tecnica, allo stato attuale, consente di scoprire molto più facilmente oggetti dalle dimensioni imponenti che pianeti simili al nostro, come giganti gassosi o super-Earth da 15 a 30 volte la massa della Terra.
In totale si sono scoperti 33 pianeti attorno a 22 delle 166 stelle osservate. Il risultato è stato che circa il 12% of solar systems are super-Earth planets, from 3 to 10 Earth masses, but the prospect is that the percentage can go up to 23% over the next year, when the technology will allow us to more easily detect the presence of planets similar to ours.
According to Howard and Marcy, they used the telescope could detect from 120 to 260 planets "conceivably land" around 10,000 stars of class G and K. "One of the goals of astronomy is to find 'age-Earth', the fraction of stars like our sun have a planet like Earth. This is a first estimate and the actual figure is probably an eight, but one in four. But there is one in 100, which is a very positive news. "
From: DITADIFULMINE.COM
ANTIKITERA.NET
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