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mugaliens
2007-Oct-11, 11:07 AM
Interesting... (http://edition.cnn.com/2007/TECH/space/10/10/cosmic.dust.ap/index.html)


Astronomers figure that the planets that formed in the past several billion years -- and those away from quasars -- came from dust that was belched from dying stars. That's what happened with Earth.

That still leaves a question about where the dust from the first couple billion years of the universe came from, which helped form early generations of star systems.

"It's formed in the wind," of the black holes, Markwick-Kemper said. Gas molecules collide in the searing heat of the quasar, which is thousands of degrees Fahrenheit, and form clusters.

"These clusters grow bigger and bigger until you can call them dust grains," she said.

That still doesn't answer the question as to where the gas particules fueling the space dust came from, but at least it does offer a plausible theory as to how gasses may be converted to dust, which would accumulate much faster than mere gasses, which would tend to dispurse rather than accumulate.

bunter
2007-Oct-11, 11:28 AM
"It's formed in the wind," of the black holes, Markwick-Kemper said

what's black hole wind? too many beans?


Gas molecules collide in the searing heat of the quasar, which is thousands of degrees Fahrenheit, and form clusters.

Molecules of gas? at thousands of degrees? Does that make it just a hot gas or is it a plasma? I keep getting confused as to why astronomers keep using the term gas if it's been ionized into a plasma.

bunter
2007-Oct-11, 11:46 AM
Just finished reading the thread what the dickens is a quasar (http://www.bautforum.com/astronomy/64730-what-dickens-quasar.html)

more and more curiouser!

Mike Holland
2007-Oct-11, 01:10 PM
Immediately after the Big Bang, the universe was essentially hydrogen, helium and radiation. The Big Bang did not create any of the heavier elements, and very little heavier than carbon.

This hydrogen and helium formed the first stars, which then processed it through hydrogen fusion to create heavier elements - carbon, nitrogen, oxygen, etc, but only when these early, giant, short-lived stars went nova were the real heavy elements, iron, lead, uranium, etc created. And when they went nova they spewed out this whole range of elements which then formed the cosmic dust out of which later stars and the planets formed.

So you are the stuff of stars, my son!

An excellent book on the formation of the elements is "Stellar Alchemy". Can't recall the author's name.

trinitree88
2007-Oct-11, 05:34 PM
Immediately after the Big Bang, the universe was essentially hydrogen, helium and radiation. The Big Bang did not create any of the heavier elements, and very little heavier than carbon.

This hydrogen and helium formed the first stars, which then processed it through hydrogen fusion to create heavier elements - carbon, nitrogen, oxygen, etc, but only when these early, giant, short-lived stars went nova were the real heavy elements, iron, lead, uranium, etc created. And when they went nova they spewed out this whole range of elements which then formed the cosmic dust out of which later stars and the planets formed.

So you are the stuff of stars, my son!

An excellent book on the formation of the elements is "Stellar Alchemy". Can't recall the author's name.

Mike...here:http://www.google.com/search?hl=en&q=book+%22Stellar+Alchemy%22&btnG=Google+Search

pete