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Universe Universe What do we know

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Universe Universe What do we know Powered By Docstoc
					    Universe
What do we know about the
        universe?
           Doppler Effect
The observed change in the frequency of
 sound or electromagnetic waves due to
 the relative motion of the source and
 observer.
                  Red Shift
   Red shift
    A change in the observed spectral lines
     towards the red end of the spectrum. Any star
     showing a red shift is moving away from
     Earth.
    Normal

    Red shift
                   Blue Shift
   A change in the observed spectral lines
    towards the blue end of the spectrum. Any
    star showing a blue shift is moving
    towards Earth.

       Normal

      Blue Shift
          Big Bang Theory
All galaxies are showing red shift. Telling
 scientist that all galaxies are moving away
 from each other. If we put this motion of
 the galaxies in reverse all galaxies would
 have been in one central location. From
 this location 13 billion years ago a large
 explosive happened sending all matter
 outward.
          Big Bang Theory
Another piece of evidence that supports the
 big bang theory, was the detection of back
 ground radiation. A low level radiation that
 is consistent throughout the universe, that
 is considered to be remnants of the big
 bang explosion.
          Evidence that supports the
                  Big Bang
   In 1965, researchers using radio telescopes detected cosmic
    background radiation, or low levels of energy evenly distributed
    throughout the universe; considered a remnant of the big bang.


Other stuff created by the big bang.
   Analyzing the background radiation, scientist have discovered that
    23% of the universe is made of a type of matter that does not give
    off light but that has gravity that we can detect, we call this matter
    dark matter.
   A material called dark energy, is relatively unknown, scientist think
    that is acts as a force that opposes gravity.
Universe Quiz
Scientists examine the light spectra from distant stars to
determine if the size of the universe is changing. Why do
astronomers believe the size of the universe is changing?

 a. The red shift indicates that distant galaxies are
     moving away from each other.
 b. The red shift indicates that distant galaxies are
     moving towards each other.
 c. The blue shift indicates that distant galaxies are
     moving away from each other.
 d. The blue shift indicates that distant galaxies are
     moving towards each other.
Measurements of light from 7 nearby stars were made. Doppler
analysis was performed and red shift was observed in all the
measurements. What does this evidence suggest about the stars?


a.   All the stars measured are moving away from the Earth.
b.   All the stars measured are moving toward the Earth.
c.   Four of the stars measured are moving away from the Earth.
d.   All of the stars are not moving relative to the Earth
  What is the following: "The universe began in a
    gigantic explosion called the ‘Big Bang.’"

a. Theory
b. Law
c. Observation
d. Fact
e. Superstition
 Which of the following statements is the best
 reason the big bang is an accepted scientific
 theory?
a. A group of people met together and decided to make
it a theory.
b. There is no other way to explain the formation of the
universe.
c. Distant galaxies were observed to be moving away
from Earth.
d. Edwin Hubble was an honest man.
Why is the Big Bang Theory the most accepted theory of
             how the universe was formed?

a. It is the simplest explanation of the current scientific
data.
b. It is based on a combination of scientific and religious
facts.
c. It has not been revised or changed by scientists for
many years.
d. It has been proven correct by using mathematical
models.

				
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