ASTRON 1010 Chapter Notes - Chapter 1: Milky Way, Virgo Supercluster, Local Group
17 Feb 2016
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Why can"t we see a galaxy 15 billion light-years away? (assume the universe is 14 billion years old) o. Because looking 15 billion light-years away means looking to a ime before the universe existed. What is our place in the universe? o. Earth is part of the solar system, which is the milky way galaxy, which is a member of the local group of galaxies in the local supercluster. The mater in our bodies came from the big bang, which produced hydrogen and helium. All other elements were constructed from h and he in stars and then recycled into new star systems, including our solar system. Reducing the size of the solar system by a factor of 10 billion; the sun is now the size of a large grapefruit, how big is earth on this scale? o. How is earth moving in our solar system? o.
