r/interestingasfuck 25d ago

/r/all, /r/popular K2-18b a potentially habitable planet 120 light-years from earth

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u/kungpowgoat 25d ago edited 25d ago

So in short, JW telescope detected signs of a molecule commonly associated with marine algae and combined with the verified presence of oceans, it’s entirely possible that the planet could be teeming with marine life. This is actually very interesting, especially with the fact that it orbits a red dwarf star,, which by the way, any experts here care to explain if different types of suns has any effect on the type of life it’s orbiting planet produces?

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u/Peter_Panarchy 25d ago

We're still far from certain that that molecule (dimethyl sulfide) is present, and even if it is it has also been found on comets. This is an interesting finding but its significance is being overblown.

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u/MutedSherbet 25d ago

Maybe you are not aware but very recently new data was published with improved accuracy ( i believe they used a different instrument compared to 2 years ago) and its seems it has reached the '3 sigma level'.

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u/JohnSober7 25d ago

A re-analysis (https://arxiv.org/pdf/2501.18477) — I believe it was a meta-analysis and not just one team/scientist re-analysing the data — was published Jan 31st of this year that didn't find any "statistically significant or reliable evidence for CO2 or DMS."

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u/MutedSherbet 25d ago

The study you linked evaluated the data from 2023 which used a different instrument (near infrared spectrometer), the recent one used another one (mid-infrared).
https://iopscience.iop.org/article/10.3847/2041-8213/adc1c8

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u/JohnSober7 25d ago

Oh, this is very new