The Observable Universe Is About 93 Billion Light-Years Across
Although the universe is about 13.8 billion years old, its expansion means the observable region is much larger than that age suggests.
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Edwin Hubble Showed the Universe Is Expanding
In 1929 he found that distant galaxies are moving away from us faster the farther they are.
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The Cosmic Microwave Background Is Leftover Glow From the Early Universe
Discovered in 1965 by Arno Penzias and Robert Wilson, it dates from about 380,000 years after the Big Bang.
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Ordinary Matter Makes Up Only About 5% of the Universe
Roughly 27% is dark matter and about 68% is dark energy.
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The Universe Is About 13.8 Billion Years Old
Scientists estimate this age by measuring the cosmic microwave background and the expansion rate.