How the color of starlight reveals our universe's expansion
In short: Professor Brian Cox explores how astronomers use light as a tool to map the history of the cosmos. By analyzing specific colors, scientists can trace the movement of galaxies back to a singular beginning.
The video explains the phenomenon of red-shift: the observation that the further away a star or galaxy is located, the redder its light appears to us. This shift in color serves as primary evidence that distant objects are moving away from Earth.
Scientists interpret this consistent movement as proof of an expanding universe. By understanding these fundamental principles of physics, we can link the behavior of light directly to the Big Bang theory.
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Sources
- Summary by Intellect · source: Brian Cox: Evidence of the Big Bang | Physics - Wonders of the Universe
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