The Atlantic

How Fast Is the Universe Expanding?

Astronomers have added a new data point in their attempts to answer the cosmic question.
Source: NASA / Reuters

Astronomers have known for nearly a century that the universe is expanding, and has been since the moment it exploded into existence in the Big Bang. Everywhere in the universe, galaxies, including our own, are moving away from each other. “Take an uninflated balloon and cover it with dots. Each point represents a galaxy,” the FAQ webpage for the Hubble Space Telescope offers as an analogy. “When you inflate the balloon

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