The universe is expanding. Edwin Hubble was studying a group of galaxies when he discovered that the galaxies were all moving away from us. Scientists today using much better technology can verify that the universe is expanding and Hubble was correct in his discovery. In an article on space.com called “The Universe Is Expanding Surprisingly Fast“, it explains that in recent studies scientists have found that the universe is expanding faster than they thought. Hubble’s constant could possibly no longer be valid because of this new finding. This number is considerably higher than the rate that was estimated by the European Space Agency’s Planck satellite mission in 2015, about 41.6 miles (66.9 km) per second per megaparsec. To test this new estimate, scientists studied how massive nearby galaxies warp the light streaming from distant, superbright galactic cores known as quasars. The number is a projection that’s based on the spacecraft’s measurements of the cosmic microwave background: the light left over from the Big Bang that created the universe 13.82 billion years ago. The expansion rate of the universe is being measured in different ways and is so precise that it may possibly point towards new physics beyond our current knowledge of the universe.
In class, the slide above shows the beginning of our universe and how old it is. It shows that as the universe expands, stars get more spread apart and less dense than when it first began. This article can relate to our conceptual objective 17 I can explain how astronomers know that the universe is expanding and how they determine the age of the universe. Once astronomers figured out that the universe is expanding, that could only mean that there was once a time where it was so compacted together and dense there had to be a “explosion”, or the Big Bang. This was the start of the universe and astronomers measure that time to be about 15 billion years ago.
I enjoyed reading this article because it informed me on how the knowledge of the expansion of the universe came to view and how astronomers today use that knowledge to figure out more on our expanding universe. Using Hubble’s constant, scientists have created and are testing a new number that could be the explanation of how fast the universe is actually expanding. This article helped me understand more about this conceptual objective an our expanding universe.