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When stars behave strangely, astronomers take notice. In the case of a star known as HD74423, it was amateur astronomers who first spotted the anomaly in data captured by NASA's latest planet-hunting space satellite TESS. What they didn't realize was that they were looking at an entirely unknown type of star -- the first of its kind.

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NASA's planet-hunting TESS mission has found its first Earth-size exoplanet in a star system only 53 light-years from Earth. Another exoplanet, a warm mini-Neptune, was found in the same system.