[moovova]

2011 preview: Expect Earth's Twin Planet

OMG! Does that mean there are two Obamas?

[Jolla]

Steven Vogt of the University of California, Santa Cruz, inhabits a “Goldilocks” zone

I bet he does

[davisfh]

If Gliese has a composition similar to earth and is 3.1 to 4.3 times the mass of Earth, the gravity would be pretty enormous. If so, it would be very difficult for humans to exist there. There might be some human-like creatures there who would be much like Superman to us. I also assume that the term “mass” used here means just that.

[mikrofon]

Wouldn't one expect to find the Goldilocks Zone in the constellation Ursa Minor?

[mamelukesabre]

this from wiki: "It is estimated that the average global equilibrium temperature (the temperature in the absence of atmospheric effects) of Gliese 581 g ranges from 209 to 228 K (−64 to −45 °C, or −84 to −49 °F) for Bond albedos (reflectivities) from 0.5 to 0.3 (with the latter being more characteristic of the inner Solar System). Adding an Earth-like greenhouse effect yields an average surface temperature in the range of 236 to 261 K (−37 to −12 °C, or −35 to 10 °F).[1][20] So it's like antarctica with MAYBE some small warm spots warm enough for liquid water here and there.

[Chode]

Nibiru???

[Chode]

Nibiru???

[SunkenCiv]

In 2010, one new exoplanet appeared every four days or so; by the end of the year, the total topped 500. But in September, a truly exceptional find punctuated this steady drumbeat of discovery: the first alien planet that could host life on its surface. Gliese 581 g...

Thanks Dallas59! The rate of new discovery will jump as new capabilities become operational, and new techniques are tried.

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[Vaquero]

2011 preview: Expect Earth's Twin Planet

[backwoods-engineer]

Gliese 581 g, spotted by a team led by Steven Vogt of the University of California, Santa Cruz, inhabits a "Goldilocks" zone around its host star, a band just warm enough to boast liquid water.

Two words: FLARE STAR.

Anything living there is going to get toasted, because the planet is going to be tidally locked, the warm side facing a star that fires mass ejections and hard radiation all the time.

The cold side is gonna be frozen.

Earth is rare in the galaxy, maybe unique. And I say this after 400+ star systems with planets discovered in our galaxy, NONE anything like ours. Keep looking, though.

[mrreaganaut]

Anybody remember the formula they made up for Star Trek to explain why there were so many alternate Earths?