What is the best description of the relationship between the expansion of the universe and the redshift of light from galaxies?
Which feature represents the best evidence of the uneven distribution of cosmic microwave background radiation?
The Big Bang can be modeled as a balloon with tiny dots drawn on it. As you inflate the balloon, it gets larger, and the dots spread apart. However, models are often limited because they cannot explain every aspect of a phenomenon. Which phenomenon caused by the Big Bang is best modeled by the dotted balloon?
Match each stage of the universe's development with its characteristic feature.
Space rapidly inflates.|The first atoms formed, and light travels freely.|The first stars and galaxies form.
Match each astronomical observation to the evidence it provides for the Big Bang Theory.
The universe is expanding.|Nucleosynthesis occurred during the early universe.|The early universe was hot and dense.
The siren sound from a passing ambulance is high-pitched as it moves toward you. But as the ambulance moves farther away, the sound of the siren stretches into a lower pitch. The Doppler effect causes this change and also helps us understand evidence about the universe's structure. Choose the correct answer from each drop-down menu to complete the statements.
redshift|away from|redshift|faster|expanding
What evidence best supports the claim that the universe is expanding?
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