BrucePartington |
07-25-13 09:28 PM |
Quote:
Originally Posted by CaptainMattJ.
(Post 2090535)
Well i always loved the fact that the only "naturally" occurring elements are hydrogen and helium, and that every other element had to be fused inside of a star. Stars the size of our own sun can only fuse up to iron before they die. The moment a star fuses iron it has seconds before it violently goes through its phases of death.
Every element above iron had to be made in the biggest explosions known to mankind: Supernovas. Stars many times more massive than our sun collapse under the astronomical gravitational forces, and are crushed to a tiny volume for miniscule amounts of time before exploding in the biggest boom in the universe since the big bang. The reason stars cant fuse anything past iron is because iron is so stable that fusion of iron doesnt release energy, it absorbs it. The only thing keeping a star from collapsing inward from gravity is the energy of fusion pushing outwards. Its like an arm wrestling competition between gravity and fusion energy. The second fusion energy starts losing, the star will fail under the gravitational forces and die. BIG BIG stars will explode into supernovas.
Based off of this, that means that the iron in your blood and your regular old skillet once destroyed a star. It also means that Every human and everything we use is stardust. Hows that for special?
http://aether.lbl.gov/www/tour/eleme...stellar_a.html
http://curious.astro.cornell.edu/question.php?number=77
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Hence the expression "we are made of star dust". Some people think it's a pick-up line, when in reality it is scientifically accurate.
Very often I think about this, and try to imagine the sheer size of the dust cloud that coalesced into our solar system.
Other star and planetary systems existed before ours came into existence.
Currently, cosmologists believe our dust cloud started to coalesce due to a nearby supernova explosion, which compressed us all (the cloud), kick-starting the gravity driven coalescence process.
And then there's us, killing each other over dead plants, before returning to the ashes.
Stating the obvious, cosmology is one of my passions. It chalenges the mind.
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