Harvard University-affiliated astronomers announced the discovery of a new asteroid zooming precariously close to Earth — only to learn it was actually a Tesla sports car launched by Elon Musk as a publicity stunt seven years ago, scientists said Friday. The Minor Planet Center in Cambridge, Mass., officially registered the new space rock Jan. 2, saying it was spotted hurling through the final frontier roughly 150,000 miles from Earth, according to Astronomy magazine. Its distance was closer to the planet than the moon— prompting the scientists to declare the asteroid had the potential to some day slam into Earth. The...