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| - | ====== Black Holes ====== | + | ====== Black Holes and Cosmology ====== |
| - | + | * [[Did stars form during the Big Bang?]] | |
| + | * [[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?]] | * [[How can X-rays escape the gravity of black holes?]] | ||
| * [[Do white holes exist and if they do can we see them?]] | * [[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?]] | ||