Write about the possibility of life in outer-space

Till now there is now proof that life exists outside earth but there is still hope that we may find it after some time.There are more than a million planets out there  in our universe and there is a high probability that one of them can support life .Life may be developed on those planets as it hass developed here but there is a high probability that it might have been developed differently also.There is also a slight chance that aliens visited our planets.
There are also few moons like the "Titan"moon of Saturn which scientists say is capable of supporting life and there is also a high probability that we may live on it if our planet runs out of space.