Bang! A Big Theory May Be Shot

A new study of the stars could rewrite the history of the universe

Astronomers trying to piece together the universe's past have two major pieces of evidence with which to work. The first is that the whole thing began with a Big Bang, an explosion of unimaginable heat and power, between 10 billion and 20 billion years ago. The second is that the modern-day cosmos is made up of galaxies. Gravity presumably played a role in the process, but the details are unknown.

For the past decade or so, the best scientific guess about the evolution of the universe has been the cold-dark-matter (CDM) theory, which holds that an exotic, unseen form of matter...

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