In another universe, free-range planets could host life

ALTERNATE UNIVERSE   A neighborhood of stars packed tightly together (illustrated) might heat interstellar space enough for an orphaned planet wandering nearby to have liquid water on its surface and, therefore, potential for life.

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NASA/ESA AND G. BACON/STSCI

Of all possible universes, ours is probably not the only inhabitable one. Universes that start under different circumstances from our own might give rise to a wide range of exotic habitable environments, researchers suggest May 24 online at arXiv.org.