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Touchรฉ de plein fouet par le changement climatique et les activitรฉs humaines, lโocรฉan change ร grande vitesse. Or il permet la subsistance de milliards dโindividus et recรจle peut-รชtre les sources dโรฉnergie de demain. ร lโoccasion de la Journรฉe mondiale des ocรฉans, le 8 juin, retour sur les nombreuses รฉtudes menรฉes sur les flots, dans cet article paru dans le numรฉro deux de la revue ยซCarnets de scienceยป.
New findings from NASA's Mars Reconnaissance Orbiter (MRO) provide the strongest evidence yet that liquid water flows intermittently on present-day Mars.
So the punch line is that Proxima b can retain liquid water on its surface for a wide range of conditionsโbut only if it held on to some water while its star went through its youthful tantrums. Another potential obstacle to habitability is the amount of energetic radiation Proxima b receives compared to Earth: 250 times more X-rays and 30 times more extreme ultraviolet light. What this means for the planetโs atmosphere is unclear, but itโs probably not a deal-breaker for life.
This is the planet we have been waiting for.
Toute l'eau d'Europe (une des lunes de Jupiter) comparรฉ ร toute l'eau de la Terre