„HD 40307 este o stea pitică bătrână, perfect liniştită, aşa că nu există niciun motiv pentru ca o astfel de planetă să nu susţină o climă ca cea de pe Terra”, a declarat Guillem Angla-Escude, de la Universitatea Goettingen din Germania, coordonatorul acestui studiu, realizat în colaborare cu Mikko Tuomi, de la Universitatea Hertfordshire din Marea Britanie.
Noua planetă are o masă de cel puţin şapte ori mai mare decât Terra, însă se află cam la aceeaşi distanţă de soarele ei ca şi Pământul de Soare, ceea ce înseamnă că primeşte o cantitate similară de energie solară ca planeta noastră.
Peste 800 de planete au fost descoperite în afara sistemului nostru solar, după detectarea primei exoplanete, la începutul anilor 1990, însă foarte puţine dintre ele se află într-o zonă locuibilă. Planeta, denumită HD 40307g, face parte dintr-un sistem solar despre care s-a crezut iniţial că avea doar trei planete, toate pe orbite prea apropiate de steaua lor pentru ca apa să existe pe ele în stare lichidă.
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