PA-99-N2PA-99-N2 is a microlensing event detected in the direction of the Andromeda Galaxy in 1999.ExplanationsOne possibility for the event is that a star in the disk of M31 gravitationally lensed a red giant also in the disk. The lensing star would have a mass between and with the most likely value near. In this case the lens profile makes it likely that the star has a planet.Possible exoplanetThe possible exoplanet would have a mass of 6.34 Jupiter mass. If confirmed, it would be the first exoplanet found in another galaxy. A similar event was seen in 1996 when a team of astronomers discovered an anomalous fluctuation in the Twin Quasar's lightcurve that seemed to be caused by a planet approximately three Earth masses in size in the quasar's lensing galaxy YGKOW G1.