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What is Expanding and What Is Not?
What is Expanding and What Is Not?
1. The observed redshift leads us to conclude that it is clusters of galaxies that are moving away from us.
- In certain instances, individual galaxies within the local group are moving toward us.
- The expansion of the universe corresponds to clusters of galaxies moving farther apart from each other.
2. A gravitationally bound object is not expanding due to the expansion of the universe.