The Big Bang Theory - EvidenceOnline version Match the piece of evidence to the information it tells us about space and the history of the universe. by Natalie Smith 1 Hubble's Law 2 Cosmic Background Radiation 3 Quasars 4 Radioactive Decay 5 Stellar Life Cycles 6 Speed of Light and Stellar Distances Everything in space is moving away from everything else. The universe is expanding. The farther apart two objects in space are, the faster they are moving away from each other. Hubble's Law Empty space in the universe is filled with microwave radiation. Photons are cooling and redshifting over time. Cosmic Background Radiation Only observed between 10-15 billion light years away. Light takes a long time to reach us, showing what was happening in the universe billions of years ago. We can observe the formation of new galaxies around supermassive black holes. Quasars Using half-life calculations lets us know the relative ages of objects. We can calculate the ages of objects in the solar system using radioactivity. Radioactive Decay Observations tell us how stars grow and change over time. We can determine how long it takes stars to grow and develop. Stellar Life Cycles Knowing this allows us to understand the size and age of the universe. Knowing how fast light moves lets us know how long it takes to travel a certain distance. Speed of Light and Stellar Distances
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