Earth

[rov1200]

With the Earth travelling near to 65,000mph why is there no sonic bang?

[another-view]

Doh!

[bookbinder]

I think that I'm right in saying that, a jet pilot doesn't hear a sonic bang that his plane creates, because he is travelling at the same speed as the thing [plane] that creates the bang. It's observers [on the ground] who are not travelling at the same speed as the plane who hear the bang. So, you'd have to be standing somewhere out there in space to have a chance of hearing a bang as the earth passed by. But you wouldn't hear it because you'd be in a vacuum. Logic, innit?

[joggerjayne]

So if we did make a "Boom" at all ... we wouldn't hear it.

But anyone listening in from Space would just hear continuous Sonic Booms.

So extraterrestrials are not coming to make peace, or to make war ...

... they just want to ask us to "keep the noise down" please !

[another-view]

No sonic booms in a vacuum. As in the old film line, "In space, no-one can hear you scream".

[Bert]

Despite the absence of sound in space, in films, whenever a spaceship or planet explodes they seem to find it obligatory to accompany the visual with a big boom or bang. It's so common, it would "sound" weird if you saw a spaceship or planet explode in utter silence.

[rov1200]

Yes you are right Bert, Star Wars for instance although Odyssey had no sound which was proved correct.

[society]

I always notion that space is where ETs lives.

[heathfield]

No sound in a vacuum. Remember the scene in the film 2001 where the astronaut fires the emergency bolts on the space-pod, and is blasted into the the spaceship airlock through the vacuum of space - without his helmet? As he is flung into the chamber, he hits the emergency pressurisation lever. At first, it being a vacuum, we hear no sound, but gradually, the hiss of the gas is heard as the chamber fills with air, until it becomes a roar as the air pressure builds to normal. Technical excellence!

[beso]

Actually an exploding planet makes a very loud bang which travels the same distance as the ejected material.

Think of the sound in movies as coming from a very robust remote microphone.

[Bert]

So you've heard this bang, have you, beso? What is the medium for the transmission of the sound? Your "robust microphone" might be rattled by being hit by ejected material, which would give a signal on a recording device attached to it, but, as there would be a vacuum around it, there would be and could be no sound.