[dmm]

1) For what it's worth, kids seem to enjoy sounds in computer games. And Hollywood puts sounds in all their space movies, so they presumably know something.

2) It's not outlandish to think that you could hear a passing ship's "exhaust" as it hit your own ship's hull. (It's a lot more reasonable than interstellar travel!) You couldn't directly hear a ship coming toward you. But perhaps sensors would be set up to generate auditory representations of the data. In any case, the crew could certainly hear their own ship.