The Voyager 1 space probe has entered the Heliosheath, an area where the solar wind drops to zero velocity. The heliosheath is the final region of our solar system and scientists believe that Voyager is within five years of crossing the heliopause, the edge of the solar system, and entering interstellar space. Scientists had previously thought Voyager was preparing to make the jump to interstellar space in 2005, but since the probe is in unknown territory, it is still sending back data which is changing astronomers’ models of the solar system. Launched in 1977, Voyager completed its mission to study the Jovian planets in 1989 when it passed Neptune. It is now located about 17.4 billion miles from Earth and is still sending back data.
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