Earliest Stars Came in Pairs, New Simulation Shows

Most stars exist in binary pairs today — and new research indicates that may have been true for a very long time. This simulation of a primordial star forming region about 200 million years after the Big Bang shows two pre-stellar cores of more than five times the mass of the sun each. The cores formed at a separation of 800 times the distance from the Earth to the Sun, and are expected to evolve into a binary star system.

Most previous simulations of the early universe, in which clouds of primordial gas collapsed to form the first luminous objects, suggest that early stars formed separately from each other.

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