David Butler
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How Fast Is It - Chapter 7 - Black Holes (4K)
How Fast Is It - Chapter 8 - Gravitational Waves (4K)
How Far Away Is It - Chapter 16 - The Cosmos (4K)
How far away is it - Chapter 10 - The Milky Way (4K)
How Far Away Is It - Chapter 3 - The Solar System (4K)
How Old Is It - Chapter 3 - Big Bang ΛCDM Cosmology (4K)
How Far Away Is It - Chapter 11 - Andromeda and the Local Group (4K)
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