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The planet becomes visible when looking for H2O or CO molecules. However, as there is no CH4 nor NH3 in its atmosphere, it remains invisble when looking for these molecules, just as its host star which contains none of those four elements.© UNIGE

Hunting molecules to find new planets

Each exoplanet rotates around a star, similar to the Earth around the Sun. This is the reason it is for the most part difficult...