Green comet zooming our way last visited 50,000 years ago
A comet is streaking back our way after 50,000 years. The dirty snowball last visited during Neanderthal times, according to NASA. Discovered less than a year ago, this harmless green comet already is visible in the northern night sky with binoculars and small telescopes, and possibly the naked eye in the darkest corners of the Northern Hemisphere.