PDA

View Full Version : Cosmoslogical Alert !



NubiWan
2001-Oct-29, 07:08 PM
Ordinary matter measured at 10% of the Universe (http://space.com/scienceastronomy/011029_normal_universe.html)

http://space.com/images/h_big_bang_0106_02,0.gif

"Astronomers believe the Big Bang first produced atomic nuclei in the first three minutes of the universe. 300,000 years later, atoms formed and light was released. Today we can still observe evidence of these primordial reactions."

<font size=-1>[ This Message was edited by: NubiWan on 2001-10-29 14:08 ]</font>

DStahl
2001-Oct-29, 09:23 PM
Nice article, NubiWan. They seem to have simplified a bit--

"According to the leading theory, an enormous nuclear explosion called the Big Bang happened 13 billion to 15 billion years ago. From it, the universe appeared in an instant, but as a billion-degree mess of neutrons, protons and electrons. The explosion was so energetic that nothing could come together close enough, for long enough, to form atoms. But the universe expanded and cooled so rapidly that within three minutes protons and neutrons bonded in twos and fours, and formed all the atomic nuclei in the universe. This Big Bang Nucleosynthesis determined how much normal matter would ever exist."

No mention of inflation, though that's kind of pivotal to out understanding. Good to read that the outstanding problem of mass and matter distribution in the large is becoming clearer, though. Thanks.

jkmccrann
2005-Dec-03, 10:36 AM
Interesting article NuibiWan, thanks. Interesting for me to consider that for 300,000 years the Universe existed in a state of perpetual darkness. That roughly equates to about 15,000 generations of humans. A long, long time, but when considering the age of the Universe, only 0.002% of the Age of the Universe.

Truly staggering timelines.

Argos
2005-Dec-03, 01:34 PM
Interesting article NuibiWan, thanks.

Oh, I forgot to thank Columbus for discoverimg america. Itīs never too late. Thanks, Cristopher!

Dave Mitsky
2005-Dec-05, 05:45 PM
Nuclear explosion???

Dave Mitsky