Many think its because there is empty space but this isn't so. Even a baseball sized rock will destroy it. How does it not crash? Im no physicist but if it is going along with the gravity how would it hit anything if everything too is going with the gravity? I might be wrong but this is a question. We all need answers. More than 35 years has passed and Voyager 1 or 2 never crashed. Discussions like these help us to understand interstellar space travel. We could one day MANtravel by jet propulsion and get resources from other planets and travel to the nearest habitable planet.
