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       xkcd - A Webcomic - Earth-Like Exoplanet (2202)
        
       Image:
 (PNG) earth_like_exoplanet.png
        
 (???) ire is actually
       something is filling the atmosphere with an unstable gas like
       oxygen. If we find a planet covered in flames, it might be an
       indicator that it supports life—or used to, anyway, before the
       fire.
        
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