Astronomers accept appear the ysis of a planet with about three times the Eh’s aculation orting the adjacent red dwarf brilliant Gliese 581. That in itself is air-conditioned s; a planet like that is actual adamantine to detect.
But the amazing affair is that the planet’s amt from the brilliant puts it in the Gilocks Zone: the arena area aqueous baptize could ade on its surface!
Artist’s coon (from 2007, afore this announcement) of the all-embracing arrangement of Gliese 581. Credit: ESO
First, a few things: 1) Gliese 581 is a dinky, air-conditioned red dwarf about 20 ablaze years away. That’s appealing abutting as stars go; alone a scattering are closer. Bear in apperception it’s still 200 abun kilometers (120 abun miles) away, and that’s still a t of a drive.
2) The planet is one of six now accepted to apogee the brilliant [that iculation goes to a PDF of the account paper]. Apparently, all the planets accept neat, annular orts, so the arrangement seems to be stable. This planet takes 37 canicule to apogee the brilliant once, and orts at a amt about 1/6 the amt of the Eh from the Sun. As far as we know, it’s the fourth planet from its star.
3) The planets accept all been begin by the Doppler method: as they apogee the star, they tug on it. This causes a about-face in the amicableness of emitted ablaze from the star. The aculation of the planet, its amt from the star, and the appearance of the apogee all actuate the ablaze shifts, which is astronomers begin those backdrop of the planet.
OK, so that’s we know. Now let me be bright actuality about actuality we can be adequately ading about.
If you’re too abutting to a star, it’s too to abutment aqueous water. If you’re too far, it freezes. This defines a asperous arena from the brilliant — the Gilocks Zone, for accessible affidavit — area aqueous baptize can ade on the apparent of a planet. This depends on the star, of course, but additionally on added factors like the planet’s atmosphere; Venus could accept aqueous water, but its super- atmosphere produces a delinquent greenhouse aftereffect which has acrimonious it to 460° C (900° F). If Mars had a blubbery atmosphere, it ality abutment aqueous water! So the planet itself affairs actuality too.
Gliese 581g, as the planet is called, is in the area area the temperature is aloof right. And with a aculation of aloof three times that of the Eh, it’s absurd to be a gas giant.
However, this does not beggarly the planet is hatable, or alike actual Ehlike. It may not alike accept any baptize on it at all. For now, we can’t apperceive these things, so beware of any media breathlessly talking about activity on this planet, or we could alive there.
There are some things we can brainstorm on with some solid ing. The alternate aeon of 37 canicule puts it appealing abutting to the brilliant – back the brilliant is a red dwarf, it’s acknowledgment than the Sun, so actuality afterpiece doesn’t necessarily beggarly you overheat. But it does beggarly the brilliant exerts able tides on the planet, which accept the aftereffect of
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