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The Big Bang Theory

The big bang theory is said to be the event that formed the universe.

Alex Bohnet

on 13 April 2011

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Transcript of The Big Bang Theory

Scientists believe that billions of years ago, the universe we live in today was incredibly small, dense and hot. The Universe has been said that it underwent a very dramatic event right at the beginning, "The Big Bang". The Universe has expanded since then, cooled down and has become much less dense.
The Big Bang Theory The most incomprehensible thing about the universe is that it is comprehensible.
- Albert Einstein When you think of the title "The Big Bang" what comes to mind?
The show
A balloon popping
Alex eating chicken..ya no

...well you've got it all wrong! >:) Those are all common misconceptions. It is actually an expansion. Rather than watching a balloon popping and releasing its contents, picture it expanding all at once. The Beginning What do you think happened? FUSING

It is said that Hydrogen atoms fused together to form Helium, and in the process they release protons. Efforts to explain...

This theory is an effort in explaining what occurred at the very commencement of our universe. Scientists have uncovered that our Universe did in reality have a beginning. There was nothing prior to that instant, it was nonexistent; throughout and following there was something, a journey commenced: our universe. The big bang theory is an act to analyze what became during and after that moment. After our presentation on the big bang theory you should be fully educated on what happened to our universe on its date of birth.

The first stage of the big bang is called the Planck epoch. The universe cooled and the energy changed into particles of matter and antimatter. The matter and antimatter then destroyed each other leaving only a bit of matter left. Then protons and neutrons formed, this all happened when the universe was only 1 second old. In the next 3 minutes, the temperature dropped below 1 billion degrees Celsius.

1. the universe has to have had a beginning.
2. background radiation, the harmless radiation that we are subjected to, is said to be the remnants of the radiation given off due to the big bang.
3. the fact that all galaxies are rapidly moving away from each other (confirmed by Edwin Hubble in 1929)
4. The night sky is not as bright as the surface of the Sun.
5. The universe was once opaque to its own radiation.
6. The universe is now dominated exclusively by matter and not a mixture of matter and anti-matter. SOURCES

- umich.edyu/~gs265/bigbang.htm
- Steven W. Hawking, George F.R. Ellis, "The Cosmic Black-Body Radiation and the Existence of Singularities in our Universe," Astrophysical Journal, 152, (1968) pp. 25-36 Goals & Objectives Common Misconceptions After the BIG expansion The Big Bang is far from being a modern myth; the Big Bang is an extremely well backed up scientific hypothesis, well supported by data. Whether it survives and how it develops will depend on findings from the vast number of astronomical observations, satellites and telescopes. But in any case, it has none of the characteristics of myth. We have shown you a presentation that is scientific, factual and logical. Conclusion "The evolution of the world can be compared to a display of fireworks that has just ended; some few red wisps, ashes and smoke. Standing on a cooled cinder, we see the slow fading of the suns, and we try to recall the vanishing brilliance of the origin of the worlds."
- Lemaitre Some proofs of the many thousands that support that this may have happened; What happened after the Big Bang?
The universe formed, along with the space time in which it exists. Expansion and a general reduction in the energy density permitted matter to form and the universe we know to begin to take shape and expand - which it is still doing. Tarryn Côté & Alex Bohnet The universe was finally cool enough for the protons and neutrons to come together forming Hydrogen and Helium nuclei. 300 000 years later, the universe had cooled to approximately 3000 degrees, at this point the atomic nuclei could use electrons to form atoms. The universe filled with Hydrogen and Helium gas. The earliest kinds of observational evidence are the Hubble-type expansion seen in the redshifts of galaxies, the measurements of the cosmic microwave background and the abundance of light elements. Today, there is also the large scale distribution and apparent evolution of galaxies which are predicted to occur due to the gravity of the structure in the standard theory. Stages of the Big Bang:
Stage 1- Planck epoch

first 10-43seconds

all the four fundamental forces — strong nuclear, weak nuclear, electromagnetism, and gravity — were unified at this point Stage 2- Grand Unification epoch

10-43 to 10-35 seconds after bang

the electronuclear force broke apart into its constituents Stage 3- Inflationary epoch
lasted only about 10-32 seconds
he universe grew from the size of a proton to the size of a grapefruit or larger
After these stages the universe cooled and expanded to what we are today.

1. The First Stage of the Big Bang is called:

a) Inflationnary epoch
b) Planck epoch
c) Grand Unification epoch
d) Big Bang Multiple Choice: 2. What happened after the three stages:

a) Stages repeated themselves
b) Stars came closer together
c) Universe cooled
d) Non of the above 3. What was the Big Bang:

a) Heat build up
b) Expansion
c) Beginning of time
d) All of the above 4. What time was the second stage of the Big Bang at:

a) 10-43 to 10-35 seconds after bang
b) 10-45 to 11-35 seconds after bang
c) 10-43 to 10-36 seconds before bang
d) 10-45 to 11-24 seconds after bang Draw a Diagram of
the Galaxies and what
happened after the Bang What caused the big Bang?

Short Answer What happened to the Hydrogen and Helium do? What is still happening that proves
the Big Bang's existance? What is the earliest
observational evidence
of the Big Bang? Thanks for watching!

-Tarryn & Alex
Full transcript