Vânătoare de planete locuibile

Kepler-10c – astronomii descoperă Mega-Terra  http://scinews.ro/ke...10c-mega-terra/

Kapteyn b și c – două exoplanete orbitează Steaua lui Kapteyn  http://scinews.ro/ka...ua-lui-kapteyn/

O echipă internațională de astronomi a descoperit două planete care orbitează în jurul Stelei lui Kapteyn, iar una dintre ele este cea mai veche planetă locuibilă descoperită până acum – Kapteyn b.

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Requirements and limits for life in the context of exoplanets

The requirements for life on Earth, its elemental composition, and its environmental limits provide a way to assess the habitability of exoplanets. Temperature is key both because of its influence on liquid water and because it can be directly estimated from orbital and climate models of exoplanetary systems. Life can grow and reproduce at temperatures as low as −15 °C, and as high as 122 °C. Studies of life in extreme deserts show that on a dry world, even a small amount of rain, fog, snow, and even atmospheric humidity can be adequate for photosynthetic production producing a small but detectable microbial community. Life is able to use light at levels less than 10−5 of the solar flux at Earth. UV or ionizing radiation can be tolerated by many microorganisms at very high levels and is unlikely to be life limiting on an exoplanet. Biologically available nitrogen may limit habitability. Levels of O2 over a few percent on an exoplanet would be consistent with the presence of multicellular organisms and high levels of O2 on Earth-like worlds indicate oxygenic photosynthesis. Other factors such as pH and salinity are likely to vary and not limit life over an entire planet or moon.

Astronomers have developed a powerful new tool that could boost the search for extraterrestrial life.

Sergei Yurchenko, Tennyson and colleagues set out to develop a new spectrum for methane. They used supercomputers to calculate about 10 billion lines — 2,000 times bigger than any previous study. And they probed much higher temperatures. The new model may be used to detect the molecule at temperatures above that of Earth, up to 1,500 K.

Gliese 832c – cea mai apropiată planetă locuibilă  http://scinews.ro/gl...neta-locuibila/

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Quote

Sfarsit de drum pentru Corot
http://spacealliance.ro/articles/view.aspx?id=20140630125231

Top Habitable Exoplanet Candidate Probably Doesn't Exist

The M dwarf Gliese 581 is believed to host four planets, including one (GJ 581d) near the habitable zone that could possibly support liquid water on its surface if it is a rocky planet. The detection of another habitable-zone planet—GJ 581 g—is disputed, as its significance depends on the eccentricity assumed for d. Analyzing stellar activity using the Hα line, we measure a stellar rotation period of 130 ± 2 days and a correlation for Hα modulation with radial velocity. Correcting for activity greatly diminishes the signal of GJ 581d (to 1.5σ) while significantly boosting the signals of the other known super-Earth planets. GJ 581d does not exist, but is an artifact of stellar activity which, when incompletely corrected, causes the false detection of planet g.

NameExoWorlds – concurs global pentru numirea exoplanetelor
http://scinews.ro/na...ire-exoplanete/

Sugestii pentru apariția vieții

Understanding organic dust is important, because such materials are more resistant to destruction during atmospheric entry, and some could have been delivered intact to the early Earth, thereby fueling the emergence of life

Kepler-438b, Kepler-442b și alte exoplanete potențial locuibile
http://scinews.ro/ke...nete-locuibile/

“We now know that Earth-sized planets have formed throughout most of the universe’s 13.8-billion-year history, which could provide scope for the existence of ancient life in the galaxy.”

• Astronomers discover a replica solar system

....dar oare ce numim noi : VIATA?!?! Poate si pe Luna , Marte,Jupiter,Saturn....etc  poate fi......viata,dar intr-o alta definitie/forma/aspect/culoare/dimesiune.....ceva ce nu putem,nu stim defini macar!!! Exista ''viata'' si pe pamint in conditii care sustinem noi ar fi la limita  imposibilului sau chiar imposibil sa existe(medii extrem de toxice/fierbinti/inghetate,etc)!!!

bogdanw, on 26 iunie 2014 - 09:30, said:

Cele mai apropiate exoplanete locuibile se gasesc in sistemul triplu Alfa Centauri la doar 4,3 a.l, dar surpriza s-ar putea sa fie chiar foarte aproape de Pamant, de exemplu in pesterile selenare sau sub crusta de gheata de sub Ceres unde ar putea exista pesteri uriase cu apa lichida, atmosfera, ..., idem si pe Marte in subteran.

Reactivat, telescopul spatial Kepler, depaseste granita de 1000 de exoplanete confirmate si promite noi recorduri pentru 2015

http://spacealliance.ro/articles/view.aspx?id=20150220123952

andromedaX, on 15 februarie 2015 - 10:27, said:

Nu este clar dacă sunt locuibile: Alpha Centauri ar putea avea două planete

NexSS – coaliția pentru căutarea vieții extraterestre

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Eu ma intreb ceva: stim bine ca undele radio se duc in spatiu. Bun presupunand ca o civilizatie avansata cat de cat aproape de noi s-a format cu un milion de ani avans....de ce nu interceptam undele lor? Doar nu si-au ECRANAT undele radio produse in un milion de ani....de fapt si 500 mii de ani avans si e suficient. Ar trebui sa vedem zeci de obiecte nave care perturba analiza spectografica a stelelor