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Edwin Hubble's Expansion Of The Universe

889 Words4 Pages

There is not much that humans know about the universe. We do not why it was created, how big it is or if it will last forever. However, as technology progresses there is much that is begin found out. For instance, scientist speculate that the universe is expanding. This amazing discovery was brought to attention by Edwin Hubble in 1920 (accel univer+ cosmo constant). Hubble was able to determine that the universe was expanding by observing the distances and velocities of several different galaxies. Through his observations, Hubble was able to quantify his observations and determine that the universe was infact expanding. Not only that, but that the universe was actually accelerating (Hubble’s Law). Meaning, the expansion of the universe was …show more content…

The paper demonstrated that galaxies are moving away from us “with a velocity that is proportional to their distance from us.” (Hubble’s Law). In other words, the further a galaxy is away from us, the faster it will distance itself. Hubble also manage to create a velocity vs. distance graph from his observations, through this graph, Hubble’s law was created. Hubble’s law is as follows: v=H0d,where v is velocity, d is distance, and the slope H0 is the Hubble Constant. Hubble was about to distinguish between the near galaxies and the further ones since further away objects are dimmer than objects near by.Thus, revealing a linear relation between galaxy velocity and its distance (Hubble’s Law). This demonstrates that galaxies “recede from each other at a constant speed per unit distance” (Hubble’s Law). Which, again, means that the further the galaxy is, the faster it will …show more content…

By comparing the light of far away and near by supernovae, similar to how Hubble compared galaxies, they found that far away supernovae was 25% more faint than it was suppose to be (Supernovae, an accel universe). In other words, the far away supernovae were too far away, thus it was founded that the universe had been accelerating for about the past eight billion years. Of course comparing the redshift (red wavelengths admitted from the supernovae explosions) of supernovae was not an easy process, especially since supernovae are pretty rare. For instance, our galaxy may produce a supernovae every 400 years. (Core

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