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The Superstructure of the Universe 1. The Universe is about ____ billion years old. The scientific ________________ that best explains the birth and evolution of the Universe is the ________________ Theory. 2. Evidence for the Big Bang includes a predicted ___ degree Kelvin echo that was discovered ____________ in 1965. The picture resolved from the echo perfectly _____________ todays structure of galaxies. Edwin __________________ discovered that the galaxies within the Universe are _____________ outward at a rate consistent with the Big Bang. 3. The observable Universe is about ____ light years in diameter. We can’t see much past that distance since light has not yet ________________ that distance. The observable Universe is only ___% of known matter in the Universe. Dark __________ is known by the way it ________ light in space and causes stars and galaxies to __________ faster than they otherwise should. 4. The Universe is full of dark __________ that is causing the Universe to __________ up at its edges. It is believed today that the Universe will likely expand _______________, cool, and grow _________. 5. The Big Bang predicts the type and distribution of _____________ we observe. ___ and ____ make up about ___% of observable matter and were the first elements to be created. Shortly afterwards as ____________ were captured by the first atoms ___________ first illuminated the Universe . The first stars formed from H and He were massive, soon clustered together and formed ________________ about ______ million years later. These supergiant stars went ___________________ and began forming the heavier _____________. 6. Major Galaxies have a basic structure of spiral_____ with a central ____________. Stars tend to group together in ______ and ________________ clusters. At least half the stars in the sky are ______________. The average star that can be seen in Earth’s night sky is ____________ light years away. Galaxies tend to group together in ______________________. The _____________ cluster is our local galaxy group of which the Milky _______ is a member. We are about 26,000 light years out from the ________ of the Milky Way which is about 100,000 light _______ in diameter and contains between 100-300 __________ stars. 7. The Andromeda __________ is our nearest neighbor at about 2.5 light years away and can be seen with the naked ______, although the Large and Small Magellan _________ and a dozen other _____________ spheroidal galaxies are nearer to us (several hundred thousand light years). 8. The center of the Universe is _________________! 9. Explain why the center of the Universe is everywhere.