Oort cloud

February 19, 2015

Alien star system buzzed the Sun

An alien star passed through our Solar System just 70,000 years ago, astronomers have discovered. No other star is known to have approached this close to […]
November 8, 2014

Mars bombarded by once-in-8-million-year meteor storm

WASHINGTON — A pristine distant comet created a once-in-8-million-year fireworks show above Mars last month. But no one got to see it live. New NASA data […]
November 28, 2013

Ison: Critical time for ‘comet of the century’

Astronomers are anxiously waiting to see if a comet survives its encounter with the Sun. Comet Ison will reach its closest approach to our star at […]
September 23, 2013

Deep Impact succumbs to 'HAL bug' as glitch messes with antenna

NASA has stopped trying to contact Deep Impact, the comet-pronging probe that in 2005 dropped an “impactor” the size of a coffee table onto comet Tempel-1. […]
September 22, 2013

Voyager’s Great Leap

Has Voyager 1 finally left the Solar System? An answer to this question has been proclaimed so many times in the last few years that it […]
March 4, 2013

Could a Comet Hit Mars in 2014?

A recently discovered comet will make an uncomfortably-close planetary flyby next year — but this time it’s not Earth that’s in the cosmic crosshairs. According to […]
December 31, 2012

2013 could be the best year for comet spotting in generations

A comet set to pass by the Earth could be the brightest in memory, and it’s not the only one coming for a visit next year. […]