Such planets are not easy to spot – they are not illuminated or warmed by the stars. Nevertheless, scientists were able to detect a large group of free-flying planets in the molecular cloud of Rho Ophiuchus. It is located 420 light years from us. Orphan planets are not small: from 70 to 170 pieces are similar in size to Jupiter. However, the masses of the planets have not yet been determined.
Their residual radiation helped to detect the objects. In total, scientists analyzed data from more than 20 years of observations of ground-based telescopes (VLT, VST, etc.), as well as the Gaia space observatory.
Why can such planets lose their stars? The point may be in various cataclysms that throw the planet out of its native system.