Five planets revealed after 20 years of observation. To confirm the presence of a planet, it is necessary to wait until it has made one or more revolutions around its star. This can take from a few days for the closest to the star to decades for the furthest away. Only a telescope dedicated to the search for exoplanets can carry out such measurements over such long periods of time, which is the case of the EULER telescope of UNIGE. Source 3a.
It's funny but sad how scientists can discover so many planets with more advancing technology yet the conditions that these worlds contain is not even remotely safe for any human life!