James Webb-teleskopet upptäcker tempererad jätteplanet med metan

22 maj 2026

Rapporterad av AI

Astronomer som använder NASA:s James Webb-teleskop har studerat atmosfären på TOI-199b, en sällsynt planet i Saturnus storlek med temperaturer omkring 80 grader Celsius. Upptäckten utgör den första detaljerade studien av en tempererad exoplanet av jättetyp.

Planeten kretsar kring en stjärna mer än 330 ljusår från jorden och fullbordar ett varv var 100:e dag. Forskare detekterade metan i dess atmosfär med hjälp av transmissionsspektroskopi under en sju timmar lång passage som observerades under totalt 20 timmar.

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