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Impressive accuracy...

Posted: Mon Dec 25, 2017 8:43 pm
by mcc
Hi,

ok, this is neither correct in a mathematical nor in a scientific way but it still impresses me a lot.
Suppose we would know that the age of the universe is exactky 13.81E9 years.
Furthermore suppose the speed of light would be exactly 300e9m/s.
And suppose dark matter would not exist, the universe would be a perfect vaccum and had expanded with
the speed of light since the Big Bang (and forget about parallel universes, the Einstein/Rosen bridges, black holes,
white dwarfs, gravity waves and other minor annoyances...)

Then...
The accuracy of our beloved DM24 is be good enough to determine the circumfence of the universe at
this very moment down to a milimeter.

WHOW!

Cheers!
Meino

Re: Impressive accuracy...

Posted: Mon Dec 25, 2017 9:18 pm
by keithdalby
mcc wrote:
Mon Dec 25, 2017 8:43 pm
suppose the speed of light would be exactly 300e9m/s
You can suppose that, if you like, but it's a wee bit fast

Re: Impressive accuracy...

Posted: Mon Dec 25, 2017 9:25 pm
by Walter
mcc wrote:
Mon Dec 25, 2017 8:43 pm
And suppose dark matter would not exist, the universe would be a perfect vaccum and had expanded with
the speed of light since the Big Bang (and forget about parallel universes, the Einstein/Rosen bridges, black holes,
white dwarfs, gravity waves and other minor annoyances...)
White dwarfs? Heard about brown dwarfs and red giants, but white ...?

Re: Impressive accuracy...

Posted: Mon Dec 25, 2017 9:28 pm
by keithdalby
Walter wrote:
Mon Dec 25, 2017 9:25 pm
White dwarfs?
They're a thing. Really dense, but no fusion. Just residual heat radiated.

Re: Impressive accuracy...

Posted: Mon Dec 25, 2017 9:37 pm
by Walter
keithdalby wrote:
Mon Dec 25, 2017 9:28 pm
Walter wrote:
Mon Dec 25, 2017 9:25 pm
White dwarfs?
They're a thing. Really dense, but no fusion. Just residual heat radiated.
Must be talking about brown dwarfs. No major fusion, internal heat suffices for IR radiation only.

Re: Impressive accuracy...

Posted: Mon Dec 25, 2017 9:43 pm
by keithdalby
Walter wrote:
Mon Dec 25, 2017 9:37 pm
keithdalby wrote:
Mon Dec 25, 2017 9:28 pm
Walter wrote:
Mon Dec 25, 2017 9:25 pm
White dwarfs?
They're a thing. Really dense, but no fusion. Just residual heat radiated.
Must be talking about brown dwarfs. No major fusion, internal heat suffices for IR radiation only.
Except white dwarfs are hot enough to emit visible radiation, I guess. Working from memory here.

Re: Impressive accuracy...

Posted: Mon Dec 25, 2017 9:56 pm
by Thomas Okken
A white dwarf is a burned-out star that is too light to become a neutron star.
https://en.wikipedia.org/wiki/White_dwarf

Re: Impressive accuracy...

Posted: Mon Dec 25, 2017 9:58 pm
by keithdalby
Thanks Thomas, just finished reading that now.

Re: Impressive accuracy...

Posted: Mon Dec 25, 2017 10:01 pm
by Walter
... me as well.

Re: Impressive accuracy...

Posted: Tue Dec 26, 2017 1:34 pm
by mcc
Hi,

...interesting which turn this discussion did...