In the beginning: Dan Hooper on the early universe – Science Weekly podcast

What happened at the dawn of the universe, just trillionths of a second after the start of the big bang, remains a mystery. Revisiting these moments in his new book, At the Edge of Time, Dan Hooper explores many of the unknowns in cosmology. Hooper guides Ian Sample through the birth of our universe to its enigmatic constituents of dark matter and dark energy

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The Perseus Molecular Cloud, a collection of gas and dust over 500 light-years across, hosting an abundance of young stars, captured by the Spitzer Space Telescope. (NASA/JPL-Caltech via AP)

Photograph: AP
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