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is a primer on scientific efforts to understand the origin, evolution, and fate of the universe. Among the questions it explores: What types of matter and energy fill the universe? What is the age and shape of the universe? How rapidly is it expanding? The website examines the Big Bang theory, as well as tests and limitations of the theory. (National Aeronautics and Space Administration)
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The Big Bang theory postulates that 12 to 14 billion years ago, the portion of the universe we can see today was only a few millimeters across. It has since expanded from this hot dense state into the vast and much cooler cosmos we currently inhabit. |
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