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How much time passed before the elements as we know them were formed?

2007-01-06 08:55:40 · 7 answers · asked by sunny p 1 in Science & Mathematics Chemistry

7 answers

The big bang initially formed quarks and radiation. Shortly thereafter (sub-microsecond), the quarks formed protons and neutrons. But neutrons are unstable, so the result was mainly protons, a smattering of helium, and a little bit of lithium; this happened in a relatively short time (I don't recall the numbers). All of the heavier elements were subsequently produced in stars, which exploded and dispersed the material into space -- a process that took millions of years. The relative abundance of U-235 and U-238 suggest that the supernova explosion which created all the elements in the earth heavier than iron took place not too long before the earth formed, 4.6 billion years ago.

2007-01-06 09:03:11 · answer #1 · answered by Anonymous · 0 0

The Big Bang Theory tells us about the creation of the Universe.
In physical cosmology, the Big Bang is the scientific theory that the universe emerged from a tremendously dense and hot state about 13.7 billion years ago. The theory is based on the observations indicating the expansion of space (in accord with the Robertson-Walker model of general relativity) as indicated by the Hubble redshift of distant galaxies taken together with the cosmological principle.

Extrapolated into the past, these observations show that the universe has expanded from a state in which all the matter and energy in the universe was at an immense temperature and density. Physicists do not widely agree on what happened before this, although general relativity predicts a gravitational singularity (for reporting on some of the more notable speculation on this issue, "see cosmogony").

The term Big Bang is used both in a narrow sense to refer to a point in time when the observed expansion of the universe (Hubble's law) began — calculated to be 13.7 billion (1.37 × 1010) years ago (±2%) — and in a more general sense to refer to the prevailing cosmological paradigm explaining the origin and expansion of the universe, as well as the composition of primordial matter through nucleosynthesis as predicted by the Alpher-Bethe-Gamow theory.

From this model, George Gamow in 1948 was able to predict, at least qualitatively, the existence of cosmic microwave background radiation (CMB). The CMB was discovered in 1964 and further corroborated the Big Bang theory, giving it an additional advantage over its chief rival, the steady state theory.
No Doubt, that we have now come to know that universe was celestial matter and how it was formed, The Holy Qur'an, The most sacred scripture of Islam, speaks about the creation of the universe 1400 yrs ago. It is mentioned in the Holy Quran, Surah Al-Ambiya, Chapter no. 21, Verse no. 30 it says:

" Do the unbelievers not see, that the heavens and the earth were of one piece , and we clove them as under, " (Holy Quran 21:30).

This verse of the holy Quran conciliates with the modern science about the creation of the universe.

2007-01-06 17:08:54 · answer #2 · answered by Xtrobe 2 · 0 0

Big Bang
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For other uses, see Big Bang (disambiguation).

According to the Big Bang, the universe emerged from an extremely dense and hot state (bottom). Since then, space itself has expanded with the passage of time, carrying the galaxies with it.In physical cosmology, the Big Bang is the scientific theory that the universe emerged from a tremendously dense and hot state about 13.7 billion years ago. The theory is based on the observations indicating the expansion of space (in accord with the Robertson-Walker model of general relativity) as indicated by the Hubble redshift of distant galaxies taken together with the cosmological principle.

Extrapolated into the past, these observations show that the universe has expanded from a state in which all the matter and energy in the universe was at an immense temperature and density. Physicists do not widely agree on what happened before this, although general relativity predicts a gravitational singularity (for reporting on some of the more notable speculation on this issue, see cosmogony).

The term Big Bang is used both in a narrow sense to refer to a point in time when the observed expansion of the universe (Hubble's law) began — calculated to be 13.7 billion (1.37 × 1010) years ago (±2%) — and in a more general sense to refer to the prevailing cosmological paradigm explaining the origin and expansion of the universe, as well as the composition of primordial matter through nucleosynthesis as predicted by the Alpher-Bethe-Gamow theory.[1]

From this model, George Gamow in 1948 was able to predict, at least qualitatively, the existence of cosmic microwave background radiation (CMB).[2] The CMB was discovered in 1964[3] and further corroborated the Big Bang theory, giving it an additional advantage over its chief rival, the steady state theory.[4]

more information
http://en.wikipedia.org/wiki/Big_bang_theory

2007-01-07 07:22:08 · answer #3 · answered by bharat s 3 · 0 0

The big bang theory says that the big bang itself released the energy and created the matter in the universe. It was extremely hot early on and has been cooling for 13.7g.a. (billion years). It was only cool enough for the first elements to come together after approx. 300,000 years when the electrons began to attach themselves to the nuclei. Of course, not all elements were formed at that time. The cooling of the universe is continuing, meaning that there will be new elements forming in the future (the radioactive elements will be more stable, and other larger atoms will arise).

2007-01-06 17:04:25 · answer #4 · answered by Anonymous · 0 0

The universe was dark for some time. There was a lot of really weird and highly unstable stuff in the first hundredth of a second. The particle physics guys are trying to work out what these particles were. These all decayed very fast and by 3 seconds the nuclei of hydrogen, and helium and lithium were formed.

After 10,000 years of darkness all of a sudden the universe lights up. By 300,000 years things have cooled down enough for electrons to join the nuclei and form atoms. At 300 million years stars form and burn fiercely using the hydrogen and through many fusion reactions the elements that we know were formed. Then these stars explode and the ash and cinders formed into our solar system.

The link shows the time line with pretty pictures.

2007-01-06 17:03:03 · answer #5 · answered by Anonymous · 0 0

The Big Bang theory is an effort to explain what happened at the very beginning of our universe. Discoveries in astronomy and physics have shown beyond a reasonable doubt that our universe did in fact have a beginning. Prior to that moment there was nothing; during and after that moment there was something: our universe. The big bang theory is an effort to explain what happened during and after that moment.

According to the standard theory, our universe sprang into existence as "singularity" around 13.7 billion years ago. What is a "singularity" and where does it come from? Well, to be honest, we don't know for sure. Singularities are zones which defy our current understanding of physics. They are thought to exist at the core of "black holes." Black holes are areas of intense gravitational pressure. The pressure is thought to be so intense that finite matter is actually squished into infinite density (a mathematical concept which truly boggles the mind). These zones of infinite density are called "singularities." Our universe is thought to have begun as an infinitesimally small, infinitely hot, infinitely dense, something - a singularity. Where did it come from? We don't know. Why did it appear? We don't know.

After its initial appearance, it apparently inflated (the "Big Bang"), expanded and cooled, going from very, very small and very, very hot, to the size and temperature of our current universe. It continues to expand and cool to this day and we are inside of it: incredible creatures living on a unique planet, circling a beautiful star clustered together with several hundred billion other stars in a galaxy soaring through the cosmos, all of which is inside of an expanding universe that began as an infinitesimal singularity which appeared out of nowhere for reasons unknown. This is the Big Bang theory.

2007-01-07 06:15:48 · answer #6 · answered by sonali 3 · 0 0

Big bang theory is a load of rubbish.

2007-01-06 20:56:53 · answer #7 · answered by Prav 4 · 0 0

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