Scientists discover the smallest extrasolar planet yet and speculate on conditions ripe for life

MOA-2007-BLG-192Lb NASA's Exoplanet Exploration Program

The search for a planet analogous to our own has taken one step closer with the discovery of the smallest extrasolar planet yet orbiting a star which could support life. It is about three and one-third times the size of Earth, much more in line with our home than the gas giants on the scale of Jupiter or Saturn we had been finding up to this point. (An even smaller planet has so far been found, but it is orbiting a pulsar. Pulsars spew highly powerful radiation, so it's highly unlikely that anything within their vicinity could survive). This new planet orbits a dwarf star, which is many thousands of times less bright that our Sun. Still, the planet could have a thick atmosphere—like Venus—which would insulate what little heat was available.

The planet was discovered using gravitational microlensing, one of a handful of techniques astronomers are currently employing to discover extrasolar planets. When two distant stars align in our field of view, the light from the star in the back is magnified as it bends around the closer star's gravitational field. We can then detect whether a planet is orbiting the star in front by how it warps the light coming from behind.

Although it is far too early to say with any certainty, the new planet, named MOA-2007-BLG-192Lb, is already speculated to have water. Water is the holy grail of prerequisites for the formation of life. It's within the right range for mass and distance from its star for liquid water to exist on its surface, but we'll need more precise measurements to know more accurately if that's true.

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16 Comments

Somehow MOA2007 BLG 192Lb doesnt seem as great as a name as Earth, or Mars. If this is in fact a habital place to live, it has to have a name that calles home. Great news though.

-You fall somewhere in the Balanced Frequency of Nature. Someone Along the Infinite Spectrum of Life.

What a wonderful discovery. It is a good idea searching for planets analogous to ours but I assume that finding another earth would be impossible because of the extreemely exqusite nature of the earth and I doubt if any other planet within and without our galaxy will come 80% close to our planet in beauty.

Extreme nature ahaha. It is a random possibility that can not be determined on how 'rare' the Earth is. There is an equal balance of all matter, and for what perception of alot, can really be a little. Beauty is what you make of it. Hostile lands are appealing to adaptive people. We live here, because no one else can.

thats really cool we kinda found life

thats really cool we kinda found life

odd, how scientists automatically assume water is essential for alien life.

Uh. I don't think there's life there. Powerful radiation. I don't think anything would want to live there.

I think water is only essential for carbon based life like ours, but I'm not sure. So basically a totally different kind of life could've evolved, but that's not too probable...

several things
1 drummtewa commenting twice makes you look realy stupid
2 there is no way of satisfactorily knowing theres life there there is just the possibility of waterwater
3 Darkfx MOA2007 BLG 192Lb is a catolog number if you think that there are enough names for planets outside our solar system when there are more extra solar objects then people and we don't even have a unique name for every human on the planet then you aren't thinking straight

who cares about the name when do i pack up and depart? we need to get this planet going with a running start people, we are running out of time.

this is good. such findings further adds support to the theory (or should i say logical assumtion based upon common sense) that we are not alone. as we sharpen our eyes that are fixated on the heavens we should see more and more of these planets

I LIKE APPLES

Hey ptdoyle,

I have a couple of comments:

1. What is "waterwater"?

2. Concerning your third "point", have you ever heard of punctuation?

Before you start flinging poo about someones writing you'd better look in your own shorts first. I think your diaper is full. Fool.

How do the scientists know if a distant planet can or cannot support alien life if they dont know anything about the alien being, such as human beings need water and oxygen,etc, to live, maybe the alien being needs different substances to sustain there life such as the radiation the Pulsar gives off, so actually I think the scientists dont really know for sure if it holds life or possibly could.

Scientist dont know anything for sure but the distance the planet is from the star gives them an estimate on how likely the possibility of life on the planet is. lets say the planet is a lot father away well then the harsh temp. and little sunlight would greatly lower the possibility. pulsars do emit lots of radiation but then theres always shelter perhaps under the crust that would allow life to evolve to become resilient to the radiation all the random variables makes it hard the get a good estimate on whether a planet has life it can support. on the other note on the composition of the life forms when we see planets in the universe and know that carbon, oxygen and hydrogen are common in the universe even though theres lots of different life composed of different elements they usually have some relation to carbon and oxygen which is known to support life but until we find something different what else can we assume.

To start with, the planet they were talking about might support life is not the one orbiting the pulsar. And they did not say "it can't support life because of the radiation". They said it was "highly unlikely" that it could support life due to the massive radiation.
The planet speculated to have water,"orbits a dwarf star, which is many thousands of times less bright that our Sun. Still, the planet could have a thick atmosphere—like Venus—which would insulate what little heat was available." They never said there was life there, only that it could possibly support life. They don't even know what the atmosphere is actually like. It's all just speculation at this point.
I think some people need to learn to read the entire article and not just the title if you're going to comment. At least that way, you might know what you're commenting on instead of throwing random thoughts out that have nothing to do whatsoever with the material content.



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