Voyager (the very first program I worked on for NASA) may or may not now be in interstellar space. The magnetic fields remain aligned as always, yet the gamma ray count hitting the craft has greatly increased, something which was thought could only happen once beyond the heliopause. Scientists are baffled and arguing about whether this is interstellar space or not.
Amazing that a nearly 40 year old spacecraft could still be revealing things never even suspected before!
Amazing that a nearly 40 year old spacecraft could still be revealing things never even suspected before!