71: Penguins on Venus?

OMG life on Venus!!! Well, now, hold on there Tex. Yes, astronomers announced this month that they'd found phosphine in the atmosphere of our planetary neighbour. And yes, phosphine is a pretty decent biosignature, a chemical that is pretty strongly associated with life here on Earth. Emily digs deep to explain the big gap between "Hey, look — phosphine! Huh." and "We found aliens!"