What is the Universe expanding into..

Do you think there was anything before the big bang?

  • I don't think there was anything before the Big Bang

    Votes: 56 12.5%

  • I think something existed before the Big Bang

    Votes: 200 44.7%

  • I don't think the big bang happened

    Votes: 54 12.1%

  • I think the universe is part of a mutiverse

    Votes: 201 45.0%
  • Total voters
    447
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#9,723
My back's a bit sore in fact.

It's that time thing again - time for a break!

I'm going to stop hunching over my laptop for now, and watch my recording of Prof Cox's Seven Days on Mars on the TV.
 

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#9,728
^ I'd give an arm and a leg for one of those! 😊

Fun Fact:
Astronomers estimate that 100 million black holes roam among the stars in our Milky Way galaxy.
Stellar-mass black holes are usually found with companion stars, but Hubble has now found one that is wandering around in a spiral arm of our galaxy all on its own.
The gravitational microlensing of a background star caused by the wandering black hole has allowed astronomers to estimate its mass as seven times the mass of the Sun.

https://www.nasa.gov/feature/goddar...lated-black-hole-roaming-our-milky-way-galaxy
 

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#9,730
I was reading about that on a different site last night.

The atoms at the top of a cloud of strontium atoms tick faster than the ones at the bottom due to the effects of gravity.

We're talking vanishingly small, but measurable, time differences here.
 

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#9,734
traderbam said:
For a really good time use caesium-133, est. 1967.
Click to expand...

Who needs a smartwatch when you can have a wristwatch in which resides a laser, a heater, a sealed cavity of caesium gas, a microwave filter and a photodiode detector?

Stare in wonderment and awe as your wristwatch counts the frequency of the hyperfine splitting of the 6s electron level! 😉
 

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#9,735
My friend Bonsai will like to know that I am at page 86 in the Lee Smolin book on Time and Gravity and Quantum Mechanics. It's all doing my head in a bit TBH.

The Mossbauer effect is incredibly exact:

https://en.wikipedia.org/wiki/Mössbauer_effect

I have done that one.

At College we just tended to do the equations without thinking about our assumptions of the Nature of these very strange things. Now I find the Universe is very strange indeed.

For instance, the Universe distinguishes between the forward arrow of Time and Time reversed! Naturally, I knew about the Neutral Kaon and CP violation but hadn't thought how odd it really is.

https://en.wikipedia.org/wiki/Kaon

Where is that coming from?

Today is June 21, and I was thinking about the Solstice and one of the World's oldest astronomical calculators. An eclipse predictor we think:

https://www.timeanddate.com/sun/uk/london?month=6

Stonehenge_groundplan.JPG


Even took a snap this morning at 4.47 AM:

IM000970.JPG


Too many buildings in the way!
 
#9,736
Making a glass go unbroken (like revising the film) after it smashes into a floor is not reversing the time arrow, it's reversing a serial string of events in the still forward ongoing timeline. The time arrow can never be reversed. Just stoped - at 0K 😉

Entropy decreasing is not a sign of a reversed time arrow. The absolute value of entropy is an indication of change; time -> i.e. ds/dt>0, no time ds/dt=0 (as I think in 0k, n o t h i n g happens, even the "quants" has taken a rest😉)

//
 
#9,737
If you take an atomic clock and move it around physically ie walk around the lab with it, you can see the time change. One of the posters here a year or so back (billshurv?) talks about seeing a movie clip about it. No doubt if you were in deep space with near enough zero gravity field, you’d also see the clock change if you moved it around due to acceleration.
 
#9,739
#9,740
Bonsai said:
If you take an atomic clock and move it around physically ie walk around the lab with it, you can see the time change. One of the posters here a year or so back (billshurv?) talks about seeing a movie clip about it. No doubt if you were in deep space with near enough zero gravity field, you’d also see the clock change if you moved it around due to acceleration.
Click to expand...
If moved perpendicular to the gravity field, will it still change time?

//
 
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