Recent content by Fontwell

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    The Mystery of Time Travel: A Keen Amateur's Question | Physics Help

    In my dreams Based on no physics whatsoever... If the unfolding of events is deterministic you could imagine history/time as one big movie. Currently we are both in and watching the 'movie'. But an actual movie, say in film format, exists all at once - you can hold it in your hands - its...
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    Can Sound Be Different on Other Planets?

    If it's an atmosphere that humans can live in I guess its going to be pretty much like the air here anyway.
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    Can Sound Be Different on Other Planets?

    A sort of example Have you ever heard someone talking who has been breathing helium? So on a helium world (unlikely!) anything that makes a sound due to resonant cavities would sound higher pitched e.g. voices, resonant empty containers. For solid objects which make a sound without any cavity...
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