Memory The Big Bang Theory - EvidenceVersión en línea Match the piece of evidence to the information it tells us about space and the history of the universe. por Natalie Smith Hubble's Law Knowing the life cycles of stars gives us an understanding of the formation of solar systems, and how long this takes. This shows when objects are moving away from you, because of the changes to the color of light. Speed of Light Radioactive Decay The universe is expanding - so, at one time, it was very small. Based of half-lives of radioactive elements, we can determine the relative ages of things within our solar system. Knowing how fast light travels allows us to determine how far apart things in the universe are, and how old they are. Stellar Formation and Evolution Galaxies were forming 10-15 billion years ago. The universe was once very hot, and has cooled off over time. Quasars Cosmic Background Radiation The Red Shift
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