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Lecture

EPSC 201 Lecture Notes - Astronomical Object, 30 Foot Fall, Neutrino


Department
Earth & Planetary Sciences
Course Code
EPSC 201
Professor
Anthony Williams- Jones

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EPSC 201
Lecture 1
The universe started off with the Big
Bang Theory. It is perceived as a
singularity. The universe was
infinitely small and hot and evolved
by expanding fairly rapidly. There
was a super hot point. The whole of
the universe was compressed into
this small volume. We evolved
through a period of quick evolution
(the first few fractions of a second).
This period of rapid expansion was
less than a second long. Matter
was soon visible (though it was really hot). That matter was really a soup. There was also anti-matter. We
would not be here if matter had no won the battle between matter vs anti-matter.
How do we know the universe is expanding?
Are stars and galaxies are moving away from us during expansion or are they at a steady state position?
As the universe expanded, the particles should be moving further apart.
The Doppler Effect: This question can be addressed by understanding the Doppler effect. The train’s
pitch increases as it moves toward you and decreases as it moves away.
The distribution of pattern of sound shows that the sound waves are further apart away from the sound
source and the sound waves are closer together next to the sound source. The distance between the
waves also demonstrates the amplitude is greater closest to the sound source.
In the electromagnetic spectrum, only waves of a particular length are visible to the naked eye. Red
waves are longest (lower frequency) and blue waves are shortest (higher frequency – more waves per a
given distance).
Stars appear to us as white however some stars are blue in color, others are red. Aria has a visible red
star as well as a nebula (a cloud of gas in which stars are born). There is a tendency of light to move
towards the blue end of the spectrum. If the celestial object is moving towards you it will tend to move
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