the universe is a oval shaped mass of planets and gases. it is about 91,000 meters wide and 12 and
16 billion years old. the galaxy was formed by a nebula of dust and gas in a spiral arm of the Milky Way galaxy about 4.6 billion years ago. Observations of cosmic microwave background helped determine the age of our galaxy. When the universe formed with the Big Bang, it was very hot.
After the first generation or so of stars, the universe started to look a lot as is does now. Large-scale structures, such as galaxies, clusters, and superclusters, had their frameworks laid in the initial giant clouds of gas. As stars formed in the same vicinity, they became gravitationally bound, and galaxies and clusters of galaxies formed. All of this happened over 10 billion years ago, and since then, the universe has been relatively the same.
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