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
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
"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 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)