sound is what is perceived by the human or dog year or whatever animal is around. if there is no receiver(nobody to hear it not even an animal) there is no sound.
this is kind of like baseball: a ball thrown from the pitcher is still a ball no matter what the batter does. if he hits it it will be a hit ball. if he missed it will be a caught ball (caught by the guy standing in front of the umpire)
Originally posted by EAPOE If a tree falls does it make a sound?
That famous question is based on the common belief that sound means the experience of sound - which is not the case. We do not say that we 'sound'. We say that we heard as sound. Whether or not you experience a sound has no bearing on whether or not the sound exists. In reality, we will actually be affected by the sound and thus do experience it even if it takes place in a forest on the far side of the earth or on Jupiter. We just wont experience it via the sense of hearing. So no, it will not turn into a lesser spotted leopard shark and do the hokey-Cokey.
Originally posted by FabianFnas Did the Big Bang really happen when noone was there witness it?
Nobody is ever 'present' at an event. Information can only travel at or below light speed and thus we can only witness past events.
We are still witnessing some of the big bang event via a number of means including:
1. actual radiation that can be 'seen'.
2. the fact that we are here.