* Sound needs a medium: Sound waves are vibrations that travel through a medium, like air or water. Space is a near-perfect vacuum, meaning there are almost no particles for sound waves to vibrate.

* No air resistance: In space, there's no air resistance to create sound waves. A spacecraft moving through space doesn't encounter the friction that causes the familiar whooshing sound of an airplane flying through the atmosphere.

* Engines can be loud: While the spacecraft itself may be silent, the engines can produce a significant amount of noise during launch and maneuvering. These sounds are often captured by microphones on board the spacecraft or from ground-based stations.

What we hear in space movies: The "sounds" of spaceships in movies are added for dramatic effect. They're actually sound effects created by sound designers to make the experience more engaging for audiences.