Last year, astronomers tentatively reported that they might have found the first known moon outside our solar system. Now, those same researchers think their claim just got a little stronger.

New observations from the Hubble Space Telescope lend credence to the idea that a moon roughly the size and mass of Neptune is orbiting about 3 million kilometers (about 2 million miles) from the Jupiter-size exoplanet Kepler-1625b, about 7,800 light-years from Earth.

For some perspective, according to René Heller (Max Planck Institute for Solar System Research, Germany), that one moon is about 10 times as massive as all the moons and rocky planets in our solar system combined.

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