How to Know Once and For All if the Universe Began With a Bang or a Bounce.

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According to the Big Bang cosmological model, our Universe began 13.8 billion years ago when all the matter and energy in the cosmos began expanding...

What is Dark Energy?

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A mysterious quantity known as dark energy makes up nearly three-fourths of the universe, yet scientists are unsure not only what it is but how it operates. How, then, can they know this strange source exists?

Researchers Tackle Question of How the Universe Became Filled With Light.

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Astrophysicists and cosmologists have therefore been pondering how the Universe could go from being in this dark, cloudy state to one where it was filled with light...