Aliens under the Ice - Life on Rogue Planets

Wandering planets is a travel alone in the universe of the planet, they are located in the space between stars and in the dark,
they are drifting alone in eternal darkness, no sunlight on their surface, can only be exposed to the cold outer space,
in the above four seasons, not day, nor night make you feel less than the passage of time, however,
How could alien life exist on rogue planets and carry it all over the universe? And how are rogue planets born?