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A comment on ‘Oumuamua, Thin Films and Lightsails. Parent comment

Re:‘Oumuamua, Thin Films and Lightsails by empath75 on Tuesday October 30, 2018 @04:36PM (#18341062)
> even atmosphere composition tweaks visible on exoplanet spectrographs

I'm fairly certain we can't detect that yet even if they had.

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Re:‘Oumuamua, Thin Films and Lightsails by gwern on Tuesday October 30, 2018 @06:43PM (#18341884)
Exoplanet atmospheres can be studied by the transit spectroscopy method. This is how water has been detected, for example. Still no oxygen or any other signatures of life. Lots of hostile atmospheres, though: https://en.wikipedia.org/wiki/Extraterrestrial_atmosphere#Ex...
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Re:‘Oumuamua, Thin Films and Lightsails by empath75 on Tuesday October 30, 2018 @07:00PM (#18341966)
I don’t think we could see a rocky planet like earth though.
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