It isn't nessesary, but the people might want to keep clean on the long journey.
a pocket knife a phone a luggage bag and a toothbrush
you would need more than a space suit!
Umm, why does a bunny need a toothbrush?
Yes, light can travel through space because it does not need a medium to propagate.
you need food water,
air and water
A spaceship.
A spaceship.
If light rays did not travel through space there would be no way for them to reach Earth.
outer space because you need some kind of physical material for sound to travel through and there's none of that in space
No, radio waves do not need a medium to travel through. They are a type of electromagnetic wave that can travel through a vacuum, such as space. They can also travel through other mediums, such as air or water.
Electromagnetic waves don't need anything to travel. This kind of waves does not need a medium to move through, therefore they can even travel through outer space.