The Big Bang is often presented as if science has completely solved the beginning of the universe: everything started in one unimaginably hot, dense state, expanded outward and eventually became the ...

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Einstein’s abandoned cosmological constant made a spectacular comeback when astronomers discovered that the universe’s expansion is accelerating. It now sits at the heart of our best cosmological ...

Astronomers using NASA’s James Webb Space Telescope have created the clearest map yet of the universe’s “cosmic web” — the enormous hidden structure that connects galaxies across space. By analyzing ...

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