In space, no one can hear you scream. Or yell, or fart, or blow up another ship. Sound doesn’t travel well in a vacuum, opting instead to not travel at all. This provides a bit of a dilemma for the Star Citizen developers, since having sound in space is dramatic and satisfying, but it’s also complete bunk in terms of actual science.
Sound designer Luke Hatton weighed in on this on the official forums, explaining that players will hear sounds from space, but they will be synthesized sounds from the computer of the ship, which will cut off when your ship takes enough damage. So you still get your dramatic sounds of ship destruction, but mostly because your onboard computer knows you want to hear it.[Source: Forums, Thanks to Cardboard for the tip!]