Astronomers have probably detected a moon outside our solar system for the first time. This is as big as the planet Neptune and thus significantly larger than the earth, said researchers at Columbia University. Of the Exoplanethe is circling as tall as Jupiter. Outside our solar system many planets have already been discovered. Researchers have never come across a moon.

The two scientists Alex Teachey and David Kipping studied 284 planets outside our solar system. Only one planet seemed to be accompanied by a moon, the Kepler-1625b. This circle in turn the star Kepler-1625, which is about the size of our sun, but older.

The researchers looked for darkening of the starlight of Kepler-1625. The main reason for the stellar brightness fluctuations would be the planet Kepler-1625b. But even a possible moon is noticeable by fluctuations in the light.

Teachey cautioned on the level of research caution: those who speak of the first Exomond make a big claim and that requires special evidence. "Besides, the size we calculated for this moon, about the size of Neptune, is hard to expect, and that's why caution is needed."

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