As the Voyager probes crossed the heliopause, they quickly detected changes in the types and levels of magnetism and radiation hitting them, signifying that they had crossed some kind of border, Brown said. However, despite its name, the heliosphere is not a perfect sphere. Instead, it is ...
The farthest any manmade object has ever traveled is approximately to the edge of the solar system. That object, the Voyager probe, is traveling 38,000 mph (61,000 kph). While that might sound speedy, it's no match for interstellar distances. For a true interstellar mission, scientists wi...
For example, there's Neptune's moon Triton, on whose surface the Voyager 2 spacecraft discovered geysers. Perhaps Triton is also a candidate for life. Then there are the short-period comets, which are routinely warmed by passage close to the Sun. They, too, might surprise us with ...