Astronomers have discovered a rocky exoplanet that’s only (potentially) friendly to life as we know it part of the time.

The planet, Ross 508 b, dips in and out of its star’s habitable zone (the region around a star where temperatures are just right for liquid water to exist on a planet’s surface) every few days, otherwise swinging too close to its star for comfort.

The National Astronomical Observatory of Japan-led team published its findings in the journal Publication of the Astronomical Society of Japan.

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