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5

L2 isn't a super stable point, but only quasi-stable. Things can't stay at that point for a long period of time without some work to stay there. Estimates say that number is around 5-16 m/s, depending on the object exactly. Sufficeth to say, most objects don't thrust to stay there naturally, so there isn't a lot of dust actually trapped at any particular L2 (...


0

This is still a bit vague - it's tough for a satellite to detect plants (with or without specifically looking for a chlorophyll signature) at low spatial density in a desert. If your hypothetical exoplanet were covered in a thick layer of cyanobacteria the signal would be much greater than the signal from a copy of Earth. However, AFAIK the best we've done ...


7

Detecting chlorophyl on exoplanets is definitely something people are interested in: see this paper (published as "Detecting biomarkers on an exo-Earth", Timothy D. Brandt, David S. Spiegel, Proceedings of the National Academy of Sciences Sep 2014, 111 (37) 13278-13283; DOI: 10.1073/pnas.1407296111), for instance. On the assumption that people are writing ...


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