Not so.

Calculations find that many universes could sustain stars
Fred Adams sees stars in the most unlikely places.

His calculations suggest that, contrary to some previous claims, stars are not only common in our cosmos but are also ablaze in myriad other universes, where the laws of physics may be drastically different. Even in a cosmos where balls of gas and dust never collapse and ignite to make conventional stars, radiation produced by black holes and clumps of invisible material called dark matter may play the same role as stars, says Adams, a theorist at the University of Michigan in Ann Arbor.

By allowing all three of the parameters, rather than a single parameter, to vary, Adams created a simulation that may embrace a larger number of possible universes, he says. He finds that stars are stable entities in roughly one-fourth of the universes he considered. "That's a sizable amount of real estate."

Had Adams found that the range of parameters that allowed for stars was very small, that would have suggested that the laws of physics in our universe have been "fine-tuned" to allow for star formation, Aguirre notes. Instead, Adams' study shows that our universe doesn't seem particularly special in that regard.

"This open-minded approach can serve, in some cases, as a counter-argument to claims that our universe is fine-tuned for life."