The Big Bang Theory

By Sarah McDiarmid

What is the Big Bang?

The big bang theory is a model for the initial development of the universe. It started off as electrons and quarks, than hydrogen and helium then stars and galaxies. Then BANG! The universe was born.

Evidence of the Big Bang Theory

"Having established the basic ideas and language of BBT, we can now look at how the data compares to what we expect from the theory. As we mentioned at the end of the last section, there is no single experiment that is sensitive to all aspects of BBT. Rather, any given observation provides insight into some combination of parameters and aspects of the theory and we need to combine the results of several different lines of inquiry to get the clearest possible global picture. This sort of approach will be most apparent in the last two sections where we discuss the evidence for the two most exotic aspects of current BBT: dark matter and dark energy." (Ryan Scranton and Bjorn Feuerbacher,2006.)


Our world is still expanding, but what will happen in the future. Scientists have different hypothesis.. Here they are

- The world will keep expanding then explode

- The world will stop

- The world will expand then shrink

Scientists Studies

People in this world are studying the big bang. They are investigating about what actually happened and what will happen in the future.

"The finding could cast doubt on the entire Big Bang theory, but other experts have serious misgivings about the results. They say the space probe used in the study is not the ideal instrument for detecting the distortions and that the discrepancy is less a reflection of problems with the Big Bang theory than of how little scientists really know about galaxy clusters.

The controversial study, led by Richard Lieu at the University of Alabama in Huntsville, is detailed in the Sept. 1 issue of the Astrophysical Journal." (Ker Than, Sept. 11th 2006)

The Doppler Effect

Defintion of the Doppler Effect

The Doppler effect , the change in frequency of a sound wave caused by a relative motion between the source of the sound waves and observer.


The length of the distance of the observer to the sound is varied. The closer the distance is a smaller length between the waves. When the length distance is further the waves are more spread out.

The HIGHER FREQUENCY = higher pitch

The LOWER FREQUENCY = lower pitch


The Doppler Effect can also be used with light.

HIGHER FREQUENCY = low wavelength. Eg. X-rays, Gamma Rays, Ultraviolet. Admitting blue and purple colours.

LOWER FREQUENCY = high wavelength. Eg. Radio, Microwave. Admitting red and orange colours.

(Low Frequency) ROGYGBIV (High Frequency)


By Sarah McDiarmid....