Listen to this:
My son asked me about space travel and we started talking about the Voyager 1 and 2 probes that were launched in the late 1970s and sent out to the outer planets. Those probes have begun their journey into interstellar space after passing out of our solar system.
NASA’s JPL (Jet Propulsion Labs) has great resources about the Voyager craft and a terrific YouTube playlist:
Stuff To Teach Our Kids 