"Once upon a time in a galaxy far, far away..."
"Once upon a time in a galaxy far, far away..." I chose an article from the SkyNews magazine from Nov- Dec 2001 describing the Andromeda Galaxy's movement towards us (blue shift), as appose to most other galaxies and objects in the universe, who are moving away from us (red shift), all as a result of the expanding nature of our universe, and in this unique case- some gravity as well. The article gives a possible explanation to the unique and different movement of the Andromeda Galaxy- that our own Milky Way Galaxy and The Andromeda Galaxy are bound together gravitationally as a pair of galaxies, which orbit around each other. It is thought that both were formed close to one another shortly after the Big Bang, and moved apart with the preceding intense expansion the new universe was experiencing. Over the years, though, (billions of them, it should be added) the gravitational attraction between them got powerful enough to overcome the force of expansion, and they are now falling towards one another. Possible consequences for this unique attraction, are also touched upon in the article, as a collision between the galaxies or a mere "dance" of movement, passing each other, with merging as it's ultimate outcome.
He suggested that the stretching of the light waves was due to the fact that the universe is expanding. The big bang " moment " it self was when the compression was extremely high and expansion was infinite. We can now appreciate the importance of measuring the quality of light from distant galaxies- it really does serve as the most direct evidence for the sudden origin of our universe, the big bang. Yet, even with Hubble's law it was difficult to determine the rate of the expansion, since it was not a constant. After the big bang gravity took place as one of the leading factors in decelerating the rate of expansion, by acting as a brake, restraining the galaxies rush outward, and gradually slowing it down. And it ended up being a galaxy not so far away. Calculations are now showing that the velocity in which it is approaching our galaxy is 50 km per second. If the object is moving towards us, the shift is towards the blue end of the optical spectrum, and is called a blue shift. " For endeavoring explanation of the 'why' component of the expanding universe The big bang theory suggests that there was nothing before it, (an understandably hard concept to accept), and once there was it was very compressed and dense needing to expand in a most pressing and intense way. The Andromeda galaxy proved to be more then just an example of blue shifted object. The big bang theory was actually constructed on the concepts of the expanding mature of the universe. Doppler shift can be defined as: " a displacement of the bright or dark lines seen in the spectrum of light from a moving object.
Common topics in this essay:
Edwin Hubble,
Milky Galaxy,
Andromeda Galaxy,
Nebula Interpreting,
Doppler Austrian,
Andromeda Galaxy's,
Vesto Slipher,
,
andromeda galaxy,
Nov- Dec,
expanding universe,
doppler shift,
Andromeda Galaxy-,
universe expanding,
towards blue,
blue shifted,
blue shift,
spectra doppler shift,
objects moving,
spectra doppler,
moving red,
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Acceptance Essays
