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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One of the stars that most interests me is this one :-

R136a1 - Wikipedia
However, stargazers, you would need a space telescope to see it as it isn't located in our galaxy!

R136a1 is located in the Large Magellanic Cloud which is a satellite galaxy of the Milky Way.

Southern Hemisphere stargazers can see four galaxies without a telescope: the Small Magellanic Cloud, the Large Magellanic Cloud, the Andromeda Galxy and our home galaxy, the Milky Way.

The photo shows the Large and Small Magellanic clouds over Paranal Observatory in Chile.

The Large Magellanic Cloud, our galactic neighbor | Astronomy Essentials | EarthSky

magellanic-clouds-Paranal-Observatory-Chile.jpg
 
Here's a good link on the sun:-

The Sun's Vital Statistics
To understand stars better, where better to start by than by exploring our Sun?

However, getting a probe to the Sun is actually very difficult, as canceling out Earth's orbital velocity and traveling towards the Sun takes 55 times as much energy as sending the same probe to Mars.

The Sun is Actually One of the Most Difficult Places to Reach in the Solar System. Here's how the Parker Solar Probe Will Do It - Universe Today

The Parker Solar Probe was launched in 2018, and by the end of its 7 year mission it will reach a distance of roughly 3.8 million miles from the Sun and fly through its corona.

Assisted by a series of gravitational slingshots with Venus, the probe will reach a speed of roughly 430,000 mph, which will set the record for the fastest-moving spacecraft in history.

Parker Solar Probe - Mission News | NASA
 

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Good day to be puzzling over the Sun. The Summer Solstice! White robes de riguer at Stonehenge. 🙂

APOD: 2021 June 20 - Sunrise Solstice over Stonehenge

I get in a bit of a muddle about angular momentum, but AFAIK the Parker probe must shed angular momentum and gain speed to get close to the Sun. In atomic theory, the lower states close to the nucleus have less angular momentum.

I was reviewing jcx's posted lecture on Geometric Algebra.

645262d1510471911-suppose-shallow-vs-steep-argument-smith_chart-jpg


I never learned transmission line theory or Smith Chart but this presentation of the IEEE paper's Geometric Algebra was fun to for me:

Applications Of Conformal Geometric Algebra To Transmission Line Theory - YouTube

builds Riemann Sphere projective model of Smith Chart then goes up to Minkowski Space to turn all S-Chart transformations into Lorentz Transforms/Rotations

Geometric Algebra links:

Geometric Algebra: A collection of useful resources []

A strange takeaway in that lecture. If you translate transmission lines, movement and rotation into 4-D Space, it is all Lorentz transformations. And all rotation. I am trying to get my head round spin and translational movement being the same thing. Only one is Tmewise and the other is more Spacewise. Er, I think. 😕
 
Just finished reading Cixin Liu's trilogy The three-Body Problem. One of the best sci-fi series I have read over a very long time. The Three-Body Problem describes an interesting configuration of a three-star (chaotic) planetary system, and the consequences for developing live and civilizations on such a planet. That in itself is very worth reading.

But the best is yet to come in the next volume, The Dark Forest, giving the most plausible solution to Fermi's Paradox I have ever read. Gives you the shivers.

Highly recommended.

Jan
 
It's rare for me to disagree with certain Science Fictional theories. But this one is a Stinker! 😀

We all know Lagrange and Poincare's ideas.

874431d1599575831-universe-expanding-albireo-jpg


AFAIK, the TriSolarians live in a hopeless unstable Triple Solar System. Therefore turn themselves into Carpet Rugs for the Bad Times.

Remembrance of Earth's Past - Wikipedia

Whilst planning to invade our own delightful Blue Planet. Well, they won't get away with it, IMO. I mean, hallucinations faster than the speed of light. What nonsense.
 
I will here now release the TNT paradox:

- A civilisation advanced enough to able to make contact and/or travel to an other civilisation would have to have been driven by DNA based greed to the point that it will have destroyed itself before being able to perform such contact or travelling.


//
 
Even longer day up here....
Though having spent solstice in Shetland, the simmer dim as they call it, that's another big leap.

And it's even sunny this morning!

Nice!. I really enjoy looking north out of my upstairs window about this time of year on clear night and seeing that there's a band of light at 12 midnight. It only really gets dark for about an hour or so after 12:30 am and then you can see it lightening up again at about 2:30 am towards the north east. I've got woods and then farmers fields beyond that and its flat. I consider myself extremely lucky
 
Speculative fiction like this can immerse the reader in a world that is entirely different from their own, with an exciting set of possibilities, new characters, and different rules.

W H Smith didn't carry copies of Liu Cixin's trilogy when I visited today, but I did obtain a copy of 'Human Universe / Forces of Nature' by Brian Cox at the bargain price of £4 as well as a copy of his 'How to Build a Universe' for only £2.50.
 

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Speculative fiction like this can immerse the reader in a world that is entirely different from their own, with an exciting set of possibilities, new characters, and different rules.

W H Smith didn't carry copies of Liu Cixin's trilogy when I visited today, but I did obtain a copy of 'Human Universe / Forces of Nature' by Brian Cox at the bargain price of £4 as well as a copy of his 'How to Build a Universe' for only £2.50.

Galu I can send you my Cixin set for the shipping. I've read them ;-)

Jan
 
I am finally getting round to my Christmas book now I have finished the front garden. Nice to sit on the bench and read.

This is a triple star like the trisolans live around:

874431d1599575831-universe-expanding-albireo-jpg


I am sure we mentioned the three-body problem recently. And this applies to the n-body problem too. Lagrange showed it always expands its volume from a given start position. So the Big Bang was bound to expand from its start position according to recent calculations.
 
Nothing is off-topic in this thread. The moderators have no idea what is going on in this one... so leave us to get on with it.

You want to see the garden. Here it is. 😎

Could suggest looking up the Pigs in Space too. On youtube. Funny as anything. The star ship "SwineTrek". Nice pirate cameo from John Cleese. 😀
 

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