For our seventeenth and final objective, I found an article titled, “Universe is Expanding up to 9% Faster Than We Thought, say Scientists“. The author, Tim Redford, begins by introducing the fact that the universe is expanding faster than anyone has previously measured or calculated from theory. This correlates to the discovery that test part of Albert Einstein’s theory of relativity, a pillar of cosmology that has withstood challenges for a century. After a finding NASA reached using the Hubble Space Telescope, NASA released that the universe is 5%-9% faster than anyone would have predicted. During this discovery, they used the telescope to measure the distance to stars in 19 galaxies beyond the Milky Way Galaxy. The article then goes forth to explain that the researchers arrived at a new expansion rate of 73.2 kilometres per second per megaparsec. A megaparsec is in comparison to 3.26 light years. Because of this adjustment, the high-level speeds over unthinkable distances is that the distance between cosmic objects will double in another 9.8 billion years. Because the observations are not making sense to NASA’s Wilkinson microwave anisotropy Probe, the predictions ultimately do not match either. The European Space Agency’s Planck satellite also correlated with the microwave anisotropy Probe in researching this topic. Both of these technological pieces proceeded into orbit to study the afterglow of the Big Bang. During this time frame, space and matter were created. Therefore, both delivered lower – and in each case slightly different – predictions for cosmic expansion, the first 5% and the second 9% lower.
We learned from our class lecture that the farther away a galaxy is the, the faster it is moving away from up. For example, if you are walking down a street and you seem someone in motion to be farther way, that means they are just moving farther and farther away from you in a fast pace. This correlates to this exact thought as well as Einstein’s predictions. In reality, the galaxies seem to be completely receding from us because entire universe is getting larger overall. In comparison to this article, the space in between the galaxies is stretching, therefore, the farther away a galaxy is the more space there is to stretch so the faster the galaxy appears to move away from us.
During our class lecture, we looked at Bing Bang expansion and its significance to the explanation of how astronomers know that the universe is expanding and how they determine the age of the universe. For example, if one elliptical galaxy passes through another elliptical galaxy, the distortion of the stars, gas, etc., in the path triggers off a new range of star formation. Therefore, we learned in our lecture that you start with an elliptical galaxy having whole stars, but as the two galaxies collided with each other, the gases are setting off new rounds of star formation. The interaction of the gravitational pull between those two galaxies will cause the spiral arms start to form. Everything gets tied into the Milky Way when deal with the formation of stars as well as the evolution of the inverse. I believe that this article was a perfect representation of our seventeenth objective, and I can confidently say that I can explain how astronomers know that the universe is expanding and how they determine the age of the universe.