Astronomer Edwin Hubble observed that the wavelength of light emitted from galaxies was long and that it shifted toward the red end of the electromagnetic spectrum. Which conclusion about these galaxies can best be made from these observations?
Which list correctly completes the model to represent how information from stars can be used to understand the nature of the universe?
This graph plots the measured velocity and distances from Earth of different galaxies. What does the graph show that supports the idea of an expanding universe?
Which of the following would be the most valid argument for the Universe expanding?
Which of the following is the best argument that celestial objects in the Universe are moving away from Earth?
Students were analyzing the speed and distance of various galaxies from Earth. Which of the following supports the claim that the farther the galaxy the faster it is moving?
Students noticed the wavelengths of light from celestial objects was shifted toward the red wavelengths of light. Some students thought this was because celestial objects are moving away from Earth. Which is the best explanation of this argument?
An astronomer was comparing two different stars and found that they are about the same size. She also found that the percentage of hydrogen in one star was much less than in the other. What can she best conclude from this observation?
Which of the following best describes cosmic background radiation?
Which of the following is NOT evidence for the Big Bang theory?
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