Space travel in itself is fairly straightforward. It's getting there and keeping the meat bag alive that's the hard part.
“Keeping the meatbag alive” is what makes it travel. Unmanned flight isn't travel.
Anything can travel. The voyager probes have traveled to the edge of the solar system. Rovers travel a cross the Martian sand. Photons travel out from the sun through the galaxy. There is noting inherently biological about the word travel.