Hubble's Laws

Our universe is expanding by light years everyday. Before you can know how and why our universe is exponentially growing, Hubble’s law, it is imperative you learn the different scales humans use to measure distance, mass, and time in space. For distance, we primarily use light years, parsecs, and the astronomical unit. Even with these units of measurement there are subsets; parsecs can go to megaparsecs. Furthermore, mass varies from planet to planet due to the different gravitational pulls. Time also varies because rotations of planets are different; therefore, seconds, hours, and days are longer or shorter depending on where you are in the solar system. As stated before, humans commonly use light years, parsecs, and the astronomical unit
Hubble’s law states that, “the distances between galaxies, or clusters of galaxies, are continually increasing and that therefore the universe is expanding.” (Infoplease) He proposed this after noticing that colors emitted from stars do not have the same wavelengths as one another in the red end of the color spectrum. People call these “red shifts.” People have speculated that these red shifts occur due to galaxies moving further away from our Milky Way galaxy. Hubble’s constant is how fast the galaxies move away from one another with time. Current evidence suggests that the galaxies move at about 73 kilometers per second per megaparsec. Back when Edwin Hubble originally created the law, he thought that the expansion rate was much larger due to him underestimating the distances between the galaxies. Scientists tend to disagree about how fast the galaxies move away from one another because they will disagree about what they think the value for Hubble’s constant should be. For this reason, scientists with high estimates of the average expansion will conclude that the galaxies have been around for less time. In contrast, scientists who think the galaxies have been around for longer think that the universe is slowly expanding. Currently, the age of the universe is thought to be 13.75 billion years. Since Hubble’s law is applicable to every galaxy, the law implies that the stretching is
Galaxies are shifting away from one another, and we have learned this from studying what is known as “red shifts.” Space exploration is continuously becoming a harder task due to this expansion. If humans would like to explore outside of our solar system, we need to travel even more light years and parsecs to reach a certain destination. This is why knowing the different scales of measurement in space is crucial. Distant galaxies are going from light years away, to parsecs away, all the way to megaparsecs away. If we know all about the expansion of the universe, we need to use this material to help calculate the exact time and place of the creation of the universe. Above all, we need to use this information in order to benefit ourselves and our vast knowledge of the