First moon outside our solar system?
In recent weeks, astronomers at Columbia University may have discovered a moon outside our solar system for the first time in history. A lot is already known about so-called exoplanets (planets outside the solar system), but the researchers have never encountered a moon in the process.
The object, which orbits the exoplanet Kepler-1625b, is said to have the size of Neptune and thus be much larger than Earth. The planet itself is about as big as Jupiter. It orbits the star Kepler-1625, which resembles our sun, but is much older. While investigating the light fluctuations of this star, the researchers discovered that they were not only caused by the exoplanet, but possibly also by a moon orbiting it.
However, sufficient evidence is still missing to describe the newly recognized object as the first moon outside our solar system. In further investigations new clues are to be found.