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Standard 1-1.A “The Big Bang Theory” Study Notes Please do not take this paper from the classroom. Use it to complete your copy of the study notes. Light from stars support the Big Bang Theory because it shows that most objects in space are moving away from one another. 2. The spectrum of hydrogen on a distant star is red shifted. 3. Stars farthest from Earth with the greatest speed have the greatest red shift. 4. Scientists accept the Big Bang theory because evidence supports it. 5. The big bang started when all matter in the universe burst from a tiny point. 6. A star moving away from Earth has a spectrum that is shifted toward red. 7. Hubble’s discovery that there was red shift in the spectra of galaxies led to an understanding that the universe is expanding. 8. Astronomers believe that cosmic background radiation formed shortly after the big bang. 9. The event which began the universe was the big bang. 10. The two elements that formed in the big bang are hydrogen and helium. 11. Scientific explanation for the origin of the universe relies on evidence from starlight and other types of radiation. 12. Technology helped Hubble make his discovery by using telescopes that collected accurate data from space. 13. Cosmic Microwave Background Radiation supports the Big Bang theory because it is energy left behind from the Big Bang explosion in the form of radiation. 14. Much of the evidence for the Big Bang theory depends on understanding the data gathered with technology. 15. The time it takes for half of a sample of a radioactive isotope to decay is called a Half-life. 16. Radioactive dating is used to determine the absolute age of rocks because radioactive decay happens at a relatively constant rate. 17. Radiometric dating is determining the age of a substance by comparison of the ratio of parent to daughter isotopes is. 18. In radiometric dating scientists compare the proportion of a radioactive parent isotope to a stable daughter isotope. 19. The atoms in a star become heavier each time it goes through a life stage. 20. A star produces all the heavier atoms found in the universe when it undergoes a “nova” or “supernova” explosion. 1.