It was Georges Lemaitre who, in 1927, came up with the idea of a Universe which had originated from a single point.
He called this the hypothesis of the primeval atom - with the primeval atom referring to what we now call the singularity.
The story started in 1922 when Alexander Friedmann discovered a solution to Einstein's equations in which the universe expanded.
Lemaitre realised if you traced the expansion of the universe backwards into the past it would get tinier and tinier until you came to a creation event - what we now call the Big Bang.
And don't forget Edwin Hubble who was the first to prove that what had previously been thought of as nebulae within the Milky Way were in fact entirely separate galaxies.
Considering most astronomers at that time thought our galaxy was unique, imagine what they'd think of the 100s of billions we've found now!
Considering most astronomers at that time thought our galaxy was unique, imagine what they'd think of the 100s of billions we've found now!
The list is long, but I will include Vera C. Rubin who studied the rotation of galaxies in detail, leading to an encounter with Dark Matter.
The observatory named after her is ready to capture fine details about the solar system, the Milky Way, and the large-scale structure of the cosmos.
https://www.technologyreview.com/20...lescope-cosmos-universe-space-digital-camera/
The observatory named after her is ready to capture fine details about the solar system, the Milky Way, and the large-scale structure of the cosmos.
https://www.technologyreview.com/20...lescope-cosmos-universe-space-digital-camera/
I wasnt around for the big bang so dont know what there was at the start of time.
Maybe there have been many big bangs, expansions then contractions ?
For me the greatest wonder of the universe is consciousness.
Life is fleeting, one minute your a child playing with toys then the next your drawing your old age pension.
Time just passes by too fast.
Maybe there have been many big bangs, expansions then contractions ?
For me the greatest wonder of the universe is consciousness.
Life is fleeting, one minute your a child playing with toys then the next your drawing your old age pension.
Time just passes by too fast.
You need to move around faster, Nigel!
Special relativity tells us that the faster the speed of a moving clock, the slower it will tick.
It sure does!. I can remember all the theories as to why time seems to pass by more quickly as you age. Now I am old myself it is easy to understand why with no doubt about the reason. It simply is that one's brain fails to hold onto any memories, it loses the intensity of all things you do very very quickly. Imagine that all memories were removed from your brain. I'm not talking about learned activities and knowledge, just memories of events that have and do take place every day. You would constantly live like a robot just reacting in real-time, very much like a robot. This is how I sort of exist now, I have a fairly normal life but the memories within every day quickly diminish. Because they are lost quickly the total amount of stored memories per day are vastly reduced. We are used to having a big store of memories when we were young and that marked out the passing time for us. Because the daily accumulation is so much less, time seems to pass by so much more quickly, I nearly live in that "robotic" existence myself nowadays. It doesn't help when I waste hours a day looking for things I have lost.... Like car keys etc 🙂 PS: The worst grief this absent mindedness caused me recently is that I replaced a cam timing belt on one of my car engines. Several critical bolts have to be tightened to a specific torque. After I had completed the very difficult lengthy job, I had no memory of what torque settings I had used, so I was tortured by the feeling I should need to do the whole strip down again and check.... The car is now sold.
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If all energy is taken into account and I mean all as in energy in every location and dimension I have accepted that there were no beginning and there will be no end. This energy has always existed and will always exist albeit in different forms - it will transform, rest, explode and what not, the 1st law survives them all...
I think...
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I think...
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Yes, I know what you mean, but somehow, I think everything I do nowadays, including new vivid and different things, (a slight exaggeration!) sinks into the accumulation of "mud" that is made out of billions of other memories. I think my brain is working nearly the same as it ever did, but it has got full up, and nothing can stand out whatever you do. Weeks are turning into days and years into just a few months. I wish it could be slowed
Low temperature heat energy is regarded as a non-usable form of energy.
In our daily energy conversions, some energy is always 'wasted' as heat.
In our daily energy conversions, some energy is always 'wasted' as heat.
You mean a perfect crystal that holds 0K?
My observation was beyond such domain aspect as walking up the stairs :-D
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My observation was beyond such domain aspect as walking up the stairs :-D
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Oh, Man : I was there ! Yes, it's a long time ago now, but let me tell you that it was a very impressive, spectacular phenomenon !
🤔😳😆😉
T
Even in the 'heat death' scenario something called vacuum energy will remain. Its possible that the BB arose from a random fluctuation in the vacuum energy of whatever may have existed before, in which case an external cycle of universal birth and death is indeed possible.
