Entering the unknown: This artist’s impression shows how plasma flows around NASA’s Voyager 1 spacecraft as it gets close to entering interstellar space Nasa’s Voyager 1 is on the verge of becoming the first human-made object to enter interstellar space, scientists say. First launched in 1977, the unmanned spacecraft has been in uncharted territory since last year. Scientists had... 

Jumpin' Jupiter: The solar system's largest planet may well have knocked another giant into deep space The consensus among astronomers is that the solar system has always had four giant planets – Jupiter, Saturn, Neptune and Uranus. But now it’s claimed that it’s much more likely to have been home to a mystery fifth giant planet that got knocked out. Computer simulations by David Nesvorny...