PDA

View Full Version : Can we live farther away from the Sun



ASTRO BOY
2013-Feb-12, 12:33 AM
Researchers from the Pennsylvania State University (USA) have proposed new borders of the habitable zone for earth-type planets. Using as a basis the corrected absorption coefficients of molecules of water and carbon dioxide, they came to the conclusion that potentially "habitable" planets should be looked for farther away from a star than it was previously considered.

Such work is very important for the planning of future projects aimed at searching for extrasolar planets, but, unfortunately, so far, we lack the understanding of how climate machines are organized; both the authors of the work and its critics accept this.

more......


http://www.spacedaily.com/reports/Can_we_live_farther_away_from_the_Sun_999.html

TooMany
2013-Feb-12, 05:53 PM
Researchers from the Pennsylvania State University (USA) have proposed new borders of the habitable zone for earth-type planets. Using as a basis the corrected absorption coefficients of molecules of water and carbon dioxide, they came to the conclusion that potentially "habitable" planets should be looked for farther away from a star than it was previously considered.

Such work is very important for the planning of future projects aimed at searching for extrasolar planets, but, unfortunately, so far, we lack the understanding of how climate machines are organized; both the authors of the work and its critics accept this.

more......


http://www.spacedaily.com/reports/Can_we_live_farther_away_from_the_Sun_999.html

That's an interesting thought. On Earth, a mere 400 ppb of CO2 is warming the climate. Given the same planet, farther from the sun, a higher CO2 content could easily keep water liquid. Solar radiation would be lower, but that just means somewhat slower plant growth. If life starts on such as system, I wonder if some feed back mechanism might keep the atmosphere protective of life, kind of like the Gaia hypothesis.

ASTRO BOY
2013-Feb-13, 05:17 AM
I have a sneaking suspicion that our theoretical habitable zone borders we apply will keep changing as we gain more knowledge.about variable and changeable conditions.

eburacum45
2013-Feb-13, 05:28 AM
I'm not convinced. I have heard the opinion that they haven't taken the reflectance/albedo of white clouds into account fully, a factor that could change the temperature of a planet significantly. Our planet is currently cooler than it has been for much of the Phanerozoic, and has extensive ice caps.

http://theresilientearth.com/files/images/Phanerozoic_Temperature.jpg

It seems likely to me that our would could be nudged a fair few million kilometres nearer the Sun before it became entirely uninhabitable.

hamdo
2013-Feb-20, 12:50 PM
Hi . I wonder that it is true and that we can live fare from our planet . I think now it is not save to live here .
Thanks for a cool information .