How far can spacecraft fly? Why ?
Incorrect. Voyager 1, Voyager 2 and Pioneer 10, all launched in the 1970s, have all left the solar system. Voyager 2 provided pretty pictures of Neptune when it passed in 1989.Well the farthest distance was Cassini to Saturn.
We can explore as far as we want. We can send a probe to another galaxy if we want....it'll just take a very long time to get there, so we don't bother.And why it can't explore any further ?