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The Most Astounding fact in the Universe

Cepheus

By Cepheus
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Moach

Moach

Posted
Posted

you know what else is kinda astounding too?

IIRC, the man narrating this, renowned physicist dr. Tyson, is known to have twitted a while back about having enjoyed himself playing a certain game with little green men that build rockets ::)

there was a post about this somewhere.... it was a while ago, but it sure was something to learn that one of the great minds of our day also enjoys kerbal rocketry ;D

thanks for sharing this! - i already knew the fact itself, but it\'s certainly eye opening to think about it in the way he does there :thumbup:

:cheers:

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Awaras

Awaras

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I said WE ARE CARBON BASED LIFEFORMS, not that we are made of carbon (coal/diamonds/graphite etc etc.)

I am sorry, but I don\'t understand the point of focusing on carbon and iron when every single element has been created from hydrogen inside stars...

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Awaras

Awaras

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It won\'t end... What makes you think that?

Every star will burn up eventually, and the universe will continue to spread and cool down. It will take billions, or maybe even hundreds of billions of years, but it will happen eventually. The time frame however is so immensely large that it is not something I lose sleep over. :)

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Grove

Grove

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Every star will burn up eventually, and the universe will continue to spread and cool down. It will take billions, or maybe even hundreds of billions of years, but it will happen eventually. The time frame however is so immensely large that it is not something I lose sleep over. :)

Star explodes...

Mass goes into the space not dissapears...

So it could create a new star...

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Awaras

Awaras

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Yes, I understand that we are carbon based lifeforms, and carbon was made in stars, but so was everything else. That is what I am saying...

Star explodes...

Mass goes into the space not dissapears...

So it could create a new star...

Stars fuse hydrogen into helium, and helium into heavier elements, generating energy. Eventually, billions of years from now, there won\'t be any more hydrogen...

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Rascal Nag

Rascal Nag

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Star explodes...

Mass goes into the space not dissapears...

So it could create a new star...

I hate to break it to you, but the heavy elements released in Supernovae aren\'t exactly ever going to start fusing. Stars can only fuse up to Iron, and even then this only happens in the biggest of stars. And when you get to iron, it collapses and explodes, and during this outburst of energy it fuses much more heavy elements which are used to create planets and sometimes life, not more stars.

So no, far in the future, new stars could not form. There would not be enough fuel. When you get here, all that\'s left are black holes, a few rogue planets (planets without stars), neutron stars, white dwarfs. Then, as time goes on, the black holes dissipate, the neutron stars have given off their energy, and all the white dwarfs cool down to black dwarfs. And these just get further and further apart with the expanding universe. Because of the expanding universe, the temperature asymptotically approaches absolute zero.

Or we could be immensely unlucky and be living in a false vacuum. If so, A bubble of energy, low energy on the inside and VERY high energy on the edges could nucleate at any moment and expand at nearly the speed of light. This would instantaneously destroy anything in its path, and we would never be aware of it coming. This is called vacuum decay, or a vacuum metastability event. Afterwards, when the entire universe has been changed into a true vacuum due to this event, not only will all things existing now have been destroyed, but the very physics of the universe would be different. Have a nice day!

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Grove

Grove

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I hate to break it to you, but the heavy elements released in Supernovae aren\'t exactly ever going to start fusing. Stars can only fuse up to Iron, and even then this only happens in the biggest of stars. And when you get to iron, it collapses and explodes, and during this outburst of energy it fuses much more heavy elements which are used to create planets and sometimes life, not more stars.

So no, far in the future, new stars could not form. There would not be enough fuel. When you get here, all that\'s left are black holes, a few rogue planets (planets without stars), neutron stars, white dwarfs. Then, as time goes on, the black holes dissipate, the neutron stars have given off their energy, and all the white dwarfs cool down to black dwarfs. And these just get further and further apart with the expanding universe. Because of the expanding universe, the temperature asymptotically approaches absolute zero.

Or we could be immensely unlucky and be living in a false vacuum. If so, A bubble of energy, low energy on the inside and VERY high energy on the edges could nucleate at any moment and expand at nearly the speed of light. This would instantaneously destroy anything in its path, and we would never be aware of it coming. This is called vacuum decay, or a vacuum metastability event. Afterwards, when the entire universe has been changed into a true vacuum due to this event, not only will all things existing now have been destroyed, but the very physics of the universe would be different. Have a nice day!

Thank you, next time I will think more before posting such dumbness from my part.

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4 IN 1

4 IN 1

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I would suggest you to watch BBC Wonders of the Solar system/ Universe to get an idea, I have to warn you though, that not everyone likes Prof Brain Cox no bull$hiting accent(which I personally liked), and the use of phase like 'billions, and billions, and billions, and billions, and billions......'(which I think is part of his charms)

Too bad that my blu-ray cannot be properly played on my new system. :(

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Guest ThatCrazyPilot

Guest ThatCrazyPilot

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Hey, guys - if there is an END to all of this, should there be something else left? I mean, if it\'s a cycle - it should repeat itself right?

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4 IN 1

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Hey, guys - if there is an END to all of this, should there be something else left? I mean, if it\'s a cycle - it should repeat itself right?

If any, there will be a big cloud of elementary particles that cannot be reform

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