The New York Times has created an interactive feature tallying all of the exoplanets discovered by NASA’s Kepler Telescope. You should really check out the link, because theirs is animated, and much bigger, and completely awesome.
This comes after news of Kepler’s detection of a new multiplanet system, with not one but two planets in the habitable zone (original research paper). Doesn’t mean that either of them would, could, or should have life, but put a check mark next to criteria #1 for biology.
This brings us to a total of 871 confirmed exoplanets, which is a drop in a drop in a drop in the bucket for how many are estimated to be out there. Those 871 confirmed exoplanets represent a mere 0.0000008% of the likely number in just the Milky Way.
Bonus: Find out more about how astrobiologists calculate the odds of extraterrestrial civilizations in this episode of It’s Okay To Be Smart: The Odds of Finding Life and Love.