We’re discovering exoplanets faster than kids finding Easter eggs, but there are still none of our size and few within the Goldilocks Zone, which is the neighborhood a planet has to be in to harbor life as we know it.
Of course, we don’t know much and we’re constantly new life in harsh climates here on Earth, extremophiles, but if an alien species evolved on a frozen planet way beyond its suns Goldilocks Zone, then they probably aren’t going to be looking at Earth because, to them, the Goldilocks Zone, the region where it’s not too hot and not too cold, is much further out. They’ll be looking for life as they know it, not life as we know it.
Most are too hot or too cold
So, as we search for planets that might be reasonable destinations for human beings, we’re looking for planets that might have liquid surface water, both close enough to the sun and far enough away from their sun that their average temperature is somewhere between 0 and 100 degrees centigrade. Because anybody we’d feel comfortable with is comfortable in that environment.
Anyway, scientists have slightly redefined that zone, shifted the boundaries a bit. First Pluto, and now this. They just can’t let things sit still. But that’s cool.
Other planets, in other solar systems, either have life upon them or they don’t. This just changes our search parameters a little bit.
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