xkcd: Exoplanets
Just how many exoplanets are now known? Oodles. Topping 500 this week with 400 more odd promised over the next year from “Kepler” and who knows how many being watched prior to the discoverers going public…
Exoplanet Encyclopedia
How Many Exoplanets Now?!
Ok. So it didn’t get over 500 that week. But plenty more planet candidates are coming soon. Greg Laughlin & Samuel Arbesman predict, based on current trends, that a legit habitable planet will be found by ~May 2011… A Scientometric Prediction of the Discovery of the First Potentially Habitable Planet with a Mass Similar to Earth