Thanks to regular brightness measurements of over a billion stars of our Galaxy, astronomers working at The Optical Gravitational Lensing Experiment (OGLE) at Warsaw University Astronomical Observatory, Poland, have discovered an unknown class of pulsating variable stars. Follow-up observations have shown that these objects are much hotter than our Sun. A very unusual property of the objects is that they significantly change their physical parameters over a period of about half an hour. Such rapid variations have never been observed in any known type of pulsating stars. Theoretical models confirm the observed behaviour, but the origin of the new stars remains a mystery. The discovery of the new class of variable stars has been published in the prestigious Nature Astronomy journal. »

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