Can anything be "still" in space?

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Offline Seany

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Can anything be "still" in space?
« on: 01/04/2008 15:14:20 »
If we put a tennis ball in space.. And we touch it so that it is very still.. Can we make it PERFECTLY still?
Is anything in space PERFECTLY STILL?
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Offline lightarrow

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Can anything be "still" in space?
« Reply #1 on: 01/04/2008 16:58:25 »
If we put a tennis ball in space.. And we touch it so that it is very still.. Can we make it PERFECTLY still?
Is anything in space PERFECTLY STILL?

Still with respect to what?

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Offline Seany

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Can anything be "still" in space?
« Reply #2 on: 01/04/2008 17:14:26 »
Oh.. I see your point.. Ahh.. Now that makes matter very difficult! [:P]
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Offline Supercryptid

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Can anything be "still" in space?
« Reply #3 on: 01/04/2008 19:46:14 »
How about still in the sense that the tennisball observes no net redshift or blueshift of the cosmic microwave background radiation?
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Offline Seany

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Can anything be "still" in space?
« Reply #4 on: 01/04/2008 20:39:51 »
Yes.. [???]
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Offline lightarrow

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Can anything be "still" in space?
« Reply #5 on: 02/04/2008 08:13:41 »
How about still in the sense that the tennisball observes no net redshift or blueshift of the cosmic microwave background radiation?
So there exist a frame of reference where this happens? What is it? Earth? Solar system? Our Galaxy centre? (I'm asking because Idon't know)

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Offline syhprum

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Can anything be "still" in space?
« Reply #6 on: 02/04/2008 09:04:37 »
Although we all long for a frame of reference the CMBR cannot be this as it is in fact expanding (else it would still have the temperature of the 'big bang' also it is not homogeneous.
« Last Edit: 08/04/2008 09:10:16 by syhprum »
syhprum

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Offline Supercryptid

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Can anything be "still" in space?
« Reply #7 on: 02/04/2008 16:52:50 »
If I'm not mistaken, things down on the subatomic level can't be perfectly still due to the Uncertainty Principle and/or interactions with vacuum fluctuations, right?
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Offline Seany

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Can anything be "still" in space?
« Reply #8 on: 02/04/2008 16:59:22 »
That's what I was thinking..
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Offline neilep

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Can anything be "still" in space?
« Reply #9 on: 02/04/2008 17:21:53 »
As a firm believer in empirical study , last night I went and looked at Space....and today I can see that it is ' still ' there !

So yes, space is ' still '  [:D]

Glad I could help.  [;)]

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lyner

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Can anything be "still" in space?
« Reply #10 on: 03/04/2008 11:11:16 »
You would have seen a different picture when you were born, tho - or even the day before. It's all on the move.