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Astronomy The study of everything beyond Earth! 5/22/2017 Order of the Universe From Largest To Smallest 5/22/2017 Universe All of space and what is found in it. Full of 100 billion galaxies with 100 billion stars each. 5/22/2017 Super Cluster Cluster of clusters of galaxies, which include the local group. Largest gravitational bound system so far. Ours=Local Group Cluster 5/22/2017 Cluster A small group of galaxies. They are held together by gravity and orbit each other. Ours = Local Group Milky Way Galaxy and its 50 closest neighbors. “Local” means the galaxies are within a region 3 million light years across. 5/22/2017 Galaxy A vast collection of dust , gas, and stars held together by gravity. Ours = Milky Way 5/22/2017 Sun’s Neighbors The sun and its 20 closest neighboring stars. One of Ours = Alpha Centauri 5/22/2017 Solar System A group of satellites revolving around a star. Ours = The sun and its collection of 8 planets. 5/22/2017 Star A hot, bubbling, glowing ball of gas. It radiates a huge amount of energy in forms of light and heat. Ours = The Sun 5/22/2017 Planet 5/22/2017 An object that revolves around a star. Ours = The Earth Natural Satellite An object that revolves around a planet Ours = The Moon 5/22/2017 What is the order? (Largest to Smallest) U___________ S___________ C__________ C ___________ G___________ S___________ N___________ S___________ S___________ S___________ P___________ N___________ S___________ 5/22/2017 Order of the Universe Universe Super Cluster Local Group/Cluster Galaxy Sun’s Neighbors Solar System Star Planet Natural Satellite 5/22/2017