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Black Holes and Cosmology
Did space exist before the Big Bang?
If the observable universe is analogous to a hollow plastic ball, then how thick is the plastic?
How can X-rays escape the gravity of black holes?
Do white holes exist and if they do can we see them?
How is it possible to look back and see the birth of the universe?
How can astronomers say that the universe is expanding without knowing where the boundaries of the universe are?
How do we know that the Universe is accelerating?
If the Universe is expanding and galaxies are rushing away from one another, why are the galaxies in the Local Group not flying apart?
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