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Willem de Sitter

Willem de Sitter

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2026-06-30

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What happened recently

News✓ Trusted
10/7/2025

The 1975 discovery of long-lost letters between Albert Einstein and the astronomer Willem de Sitter

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News✓ Trusted
3/31/2023

Seeing is more than believing: Exploring 'de Sitter space' to explain gravity in the expanding early universe

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