[Woolygimp]

There's a few things that I've seen on television that absolutely do not make sense so I just want to clarify.

When you see a spaceship fly by you always hear the engines pulsing. Well how can sound exist in space when it's a vacuum and there are no particles in which vibrations can exist?

How can fire exist in space without oxygen or being powered by excessive energy such as a byproduct of fusion?

For this one let's assume you have a 25hp space drive. Since everything in space is weightless, shouldn't this 25hp space drive be able to propel a basketball sized craft just as fast as something like the Death Star?

Also if a person were to have a stable platform for his leg muscles to operate, couldn't he move something as large as the Death Star if there were no counter forces operating against him?

Why do they constantly show things decelerating in space without the use of counter thrusters since inertia without resistance should result in perpetual motion?