what are the things that a spacecraft should do so it can overcome the challenges of intergalactic travel?

If a spacecraft is in space for a long time, radiation is a problem. Designers must figure out a way to protect astronauts from the radiation.

Food and Water,Proper Propulsion,Radiation Protection,etc are the things that a spacecraft should do so it can overcome the challenges of intergalactic travel.

Explanation:

Star Wars would have you believe that the greatest challenges to space travel is asteroids, lack of resources like water or fuel, or even the threat of unfriendly, intelligent alien life. But in reality, scientists are finding that the biggest obstacle to today's space travel is dust.