We have sent a total of four space probes beyond the confines of the solar system, with one more quickly approaching the edge. The Voyagers have given us a decent amount of good data about interstellar space, but they weren't designed for it, and it's the same story for New Horizons when it gets out that far. Those probes can only tell us so much. So now NASA has a new mission in the works, though it's still very early, to send a purpose-built space probe out to study interstellar space. The mission, which will hopefully launch in the mid 2030s and will last around 50 years, will involve the probe blasting out quickly (relatively speaking that is) to around 1,000 AU and examining the heliosphere, which is where the sun's influence ends. It's an ambitious mission, and I really hope it actually happens.
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