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The false star is part of the space agency's $19.5 million mission dubbed Landolt, and is designed to allow scientists to get more accurate measurements of real stars. Researchers suggest it could even help study dark energy, the mysterious hypothetical form of energy that's been used to explain why the universe is expanding at an accelerating rate. "Even with today's modern instruments, measurements of the true brightness of stars have only been known to a few percent," said NASA Exoplanet Science Institute deputy director and Caltech astronomer David Ciardi in a statement. "Landolt will enable an improvement in those measurements by more than a factor of ten."

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