I had assumed that Phil would be all over this thread by now, and it's kind of old news at this point, but it's really an astonishing discovery. The basics:
-The system is referred to as TRAPPIST-1, and there are seven Earth-size planets orbiting an ultra-cool dwarf star 39 light years away (the Milky Way is about 100,000 light years across).
-They're much, much closer to their star than we are to our sun, but since the star is about 1/10 the diameter of our sun and burns with about 2000x less light, their proximity to it creates the ideal level of warmth and light required to create oxygen.
-All seven of the exoplanets are within the range to sustain life, but three of them are firmly in the habitable zone.
-If they discover (likely within the next decade) that there is oxygen in any of the planets' atmospheres, then that means there are probably oceans, and oceans mean life.
-The craziest part is that we're still talking about just our galaxy, the Milky Way, and we haven't even come close to discovering everything in it, and we likely never will. But there's an infinite universe beyond the Milky Way that we have yet to tap in to. We've discovered over 300,000 planets in our galaxy alone over the past few decades.
If you're bored at work, read up on it a bit. It's really, really unbelievable. This is the closest we've come to finding life outside of Earth.