Andromeda, or M31, is a spiral galaxy similar to our own Milky Way. For the first time, a spinning neutron star has been inferred in XMM-Newton data.  Inset: Light curve of the source, known as 3XMM J004301.4+413017, as analysed by XMM-Newton's European Photon Imaging Camera, EPIC. The source has a period of 1.2 seconds, consistent with a spinning neutron star. Credit: ESA/Herschel/PACS/SPIRE/J. Fritz, U. Gent/XMM-Newton/EPIC/W. Pietsch, MPE; data: P. Esposito et al (2016)
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