Detectability of life and photosynthesis on exoplanets.

Lars Olof Björn, George C. Papageorgiou, Dainis Dravins, Govindjee Govindjee

    Forskningsoutput: Bidrag till övrig tidskrift/dags- eller nyhetstidningArtikel i facktidskrift eller populärpressPopulärvetenskap

    Sammanfattning

    ‘Is there life on exoplanets?’. We refer to exoplanets as planets in other solar systems than our own. This often
    asked question can be further refined by asking ‘is there life on exoplanets which is so extensive that it may
    impact on its atmosphere, its biosphere and its optical properties?’. And if such a life exists, at astronomical
    distances from us, can we detect it with instruments on Earth-based or Earth-orbiting observatories? Will
    then, in that case, our advanced knowledge of present-day and early-day photosynthesis on Earth help us
    select appropriate biosignatures that may signal its presence? Here we elaborate further on these themes,
    based on the most recent literature, and from the point of view of photosynthesis. We also provide our considered
    views. Although search for chlorophyll is considered desirable, we conclude that our best bet is to
    look for and analyse photosynthesis-related gases, namely O2, CO2 and H2O vapour. We shall keep in mind
    that the evolutionary tree of life on our planet has its roots in autotrophy, and of the various forms of autotrophy,
    only oxygenic
    Originalspråkengelska
    Sidor1171-1175
    Volym96
    Nummer9
    SpecialistpublikationCurrent Science
    FörlagCurrent Science Association and Indian Academy of Sciences
    StatusPublished - 2009

    Ämnesklassifikation (UKÄ)

    • Astronomi, astrofysik och kosmologi
    • Biologiska vetenskaper

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