Where is Voyager 2

The "expanding" universe thing always gets me. What is it expanding into? And if it expanding there has to be a universe there to expand into. If the universe does have a finite size, what's over the boundary where it stops expanding?

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Originally Posted by spudfan

The "expanding" universe thing always gets me. What is it expanding into? And if it expanding there has to be a universe there to expand into. If the universe does have a finite size, what's over the boundary where it stops expanding?

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No, there does not have to be anything it expands into - we do not know where or whether there is a boundary to the universe. Since the universe is expanding, the further you go away, the faster objects are receding, and eventually, you reach a distance that is receding at a speed that makes the redshift so large that no radiation from there is within the frequency range of radio telescopes - and beyond that is unobservable, so what is beyond the edge or whether there is an edge is unknowable. Furthermore, you get to the distance that is so great that radiation from there has taken the age of the universe to get here, so it is impossible for us to get any knowledge from beyond that distance.

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Originally Posted by JDNSW

I think what you are after is this :-
The galactic coordinate system is a celestial coordinate system in spherical coordinates, with the Sun as its center, the primary direction aligned with the approximate center of the Milky Way Galaxy, and the fundamental plane parallel to an approximation of the galactic plane but offset to its north. It uses the right-handed convention, meaning that coordinates are positive toward the north and toward the east in the fundamental plane.<sup>[1]

https://en.wikipedia.org/wiki/Galact...rdinate_system</sup>

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Thanks John,
I think I'll need to read that a few time to get my head around it.

Tony

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Originally Posted by spudfan

The "expanding" universe thing always gets me. What is it expanding into? And if it expanding there has to be a universe there to expand into. If the universe does have a finite size, what's over the boundary where it stops expanding?

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This stirred a deep recess in my mind. In the late '60s, early '70s, I coined the term,

"Infinity: a measureless measurement of a timeless time".

I can't remember the occasion, though.

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Originally Posted by Saitch

This stirred a deep recess in my mind. In the late '60s, early '70s, I coined the term,

"Infinity: a measureless measurement of a timeless time".

I can't remember the occasion, though.

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Probably a first date and you were trying to impress the girl?

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Originally Posted by Saitch

This stirred a deep recess in my mind. In the late '60s, early '70s, I coined the term,

"Infinity: a measureless measurement of a timeless time".

I can't remember the occasion, though.

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I see that caught on[bigwhistle]

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Originally Posted by spudfan

Probably a first date and you were trying to impress the girl?

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More likely listening to some Hawkwind! [bigsmile1]

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Originally Posted by Saitch

More likely listening to some Hawkwind! [bigsmile1]

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With some Michael Moorcock thrown in for good measure. Then there was Stacia dancing around for good measure. Yep a good place to be.....

https://cdn.mos.cms.futurecdn.net/YC...SJZ-320-80.jpg

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Originally Posted by spudfan

With some Michael Moorcock thrown in for good measure. Then there was Stacia dancing around for good measure. Yep a good place to be.....

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Ever get to any concerts, Spudfan?
The closest I got was seeing Simon House at a Bowie gig. [smilebigeye]