Five robotic spacecraft have sufficient velocity to escape the bounds of our solar system and travel into interstellar space but only one nasa s voyager 1 has crossed that boundary so far.
Manned mission outside solar system.
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However radiation from these would.
This could come in handy for manned missions even long duration manned missions within the outer reaches of our solar system at keplerian velocities as well as to provide ways to correct biological damage resulting from cosmic radiation.
Voyager 1 transitioned into interstellar space in 2012.
The 1980 television series cosmos featuring voyager mission scientist carl sagan took viewers on a factual tour of the known universe and sparked the imaginations of many present day scientists and engineers.
Voyager 2 likely will be next.
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There are a number of ideas for how we could finally escape our solar system including fusion rockets which are being perused by a nasa funded company.