The Holy Grail in exoplanet science is to look for habitable worlds and the presence of life, but all the features that have been talked about so far have been beyond the reach of the newest observatories. Now we have a way to find out if there's liquid water on another planet. And it's something we can get to in the next few years.
An idea came to us by looking at what's going on with the terrestrial planets in our own system.
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