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Karl Schwarzschild was a German physicist and also an astronomer. He is regarded as the father of astrophysics.

Albert Einstein was also German-born theoretical physicist. He was known for developing the theory of relativity.

Karl Schwarzschild used Einstein's ideas about space bending to reach a conclusion that black holes are possible when stars spin at a high speed and eventually collapse.

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Sample Response: Einstein was a dedicated scientist. He worked hard, focused on details, and did not give up until he had formed a theory that worked. His ideas were bizarre, but they helped scientists make many discoveries.

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