The Discovery Channel did the math and extrapolated how many possible planets there could be in our galaxy based on the data already received from the Kepler probe, which has already discovered over 1200 planets.
And they estimate 500 MILLION of those could be habitable.
That really puts the vastness of our galaxy into perspective.
Take the numbers further and imagine how many planets there could be in other galaxies in the universe and the numbers easily go beyond the Trillions.
We really need to get out there and start exploring!