If a neutron star or black hole was detected, say, only one parsec from here, would it help space exploration?
Could it be used as a gravity assisted flyby portal for interstellar space flight? I suppose that it depends on its speed relative to us and the star we'd like to travel to. But some star remnants have very high velocities because of their violent formation history. And wouldn't a close binary neutron star would be a gold mine for gravity assists.