How do we know the universe is expanding? Educators, explore Doppler shift with your high school students and help them calculate the redshift of a supernova, determine its velocity relative to Earth, and find the distance to that object: https://go.nasa.gov/3M0Dwwa #BackToSchool | NASA Universe
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NASA Scientific Visualization Studio | Redshift Animations
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The farther away a galaxy is, the redder it appears to our telescopes. This strange phenomenon is called “redshift.” Here’s how it works and why distant galaxies look red: | NOVA l PBS
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