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Name ____________________________ Date ____________ Period ______ Cosmology Vocabulary Write your personal definition to the words listed below. 1. Scientific Method—approach to investigation; includes observation, theory and testing 2. Theory—explains a set of observations and predicts what will happen; can be changed if there is new evidence 3. Cosmology—study of the structure and evolution of the entire universe including space, time, matter, and energy 4. Astronomy—branch of science dedicated to the study of everything in the universe that lies above Earth’s atmosphere 5. Solar System—the sun and all the bodies that orbit it 6. Celestial Sphere—imaginary sphere surrounding Earth to which all objects in the sky were once considered to be attached 7. Star—a glowing ball of gas held together by its own gravity and powered by nuclear fusion in its core 8. Galaxy—gravitationally bound collection of stars 9. Galaxy Cluster—collection of galaxies held together by gravity 10. Universe—the totality of all space, time, matter and energy 11. Light Year—the distance that light travels in 1 year; 10 trillion km 12. Geocentric—Earth is the center of the solar system 13. Heliocentric—the Sun is the center of the solar system 14. Big Bang Theory—Event that cosmologists consider the beginning of the universe