Philosophical musing...

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Andy_R

Hard of hearing..I said Herd of Herring..oh FFS..
Location
County Durham
So, I was walking the dog tonight, and we had a very clear sky. Looking up, I had a sudden philosophical moment. How many of those stars that I can see tonight, actually still exist, given the time it takes for their light to reach us. Dog didn't seem interested...but they exist purely in the here and now and can't produce a reasoned argument...
 

Drago

Legendary Member
4.
 

markemark

Über Member
So, I was walking the dog tonight, and we had a very clear sky. Looking up, I had a sudden philosophical moment. How many of those stars that I can see tonight, actually still exist, given the time it takes for their light to reach us. Dog didn't seem interested...but they exist purely in the here and now and can't produce a reasoned argument...
And there’s the rub about finding messages from Alien planets. By the time a message reaches us, they’d all be dead. By the time our message gets back to them, humans would be long gone.
 

Beebo

Firm and Fruity
Location
Hexleybeef
Most of them you can see are fairly close to us in our little corner of the galaxy.
It’s the ones on other galaxies that are millions of light years away.
 
OP
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Andy_R

Andy_R

Hard of hearing..I said Herd of Herring..oh FFS..
Location
County Durham
Most of them you can see are fairly close to us in our little corner of the galaxy.
It’s the ones on other galaxies that are millions of light years away.
Yes, the brightest and closest are in our little corner of the ever expanding universe, but it still makes me wonder - Betelgeuse in the Orion constellation is only 429 light years away, so we're looking at the early 1600's, but in the same constellation Alnilam is over 1300 light years away so what we are seeing there actually happened when the Vikings invaded northern England.
 

Beebo

Firm and Fruity
Location
Hexleybeef
Yes, the brightest and closest are in our little corner of the ever expanding universe, but it still makes me wonder - Betelgeuse in the Orion constellation is only 429 light years away, so we're looking at the early 1600's, but in the same constellation Alnilam is over 1300 light years away so what we are seeing there actually happened when the Vikings invaded northern England.
1300 years is statistically insignificant in the life of a star so the chances of any one star being no longer here is almost zero. But spread over millions of stars means that some will be gone, but most likely the ones much further away that we can’t see with a naked eye.
The Egyptians were building pyramids 4000 years ago and the sky would have looked identical.
 

newfhouse

Resolutely on topic
the sky would have looked almost identical
FTFY. Don’t forget that the whole solar system is moving within the spiral arm of our galaxy. As a rule of thumb, the closer the star, the greater the likelihood of an apparent change of position.
https://en.wikipedia.org/wiki/Proper_motion
 

oldwheels

Legendary Member
Location
Isle of Mull
Thinking back to my school days the easiest concept is to think of a molecule. We are part of a molecule which in turn is part of something bigger. Probably a bit of a chair leg in some massive entity, or mebbe a 4candle.:wacko:
 
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