To find the planet, the team pored over research from NASA's Kepler telescope, analyzing the tiny dips in light visible from stars, indicating that a planet might be passing in front. This particular star is younger than ours, and rotating twice as fast, which may have some influence on how Kepler 78b is able to exist. Not that Kepler 78b is a pleasant place; the researchers believe it's made of some highly dense material, but that its surface is about 5,000° F and covered in oceans of boiling lava. Oh, and it completes its year in about as long as you complete one (relatively light!) day of work. It's one of the fastest orbits ever detected.