To date, astronomers have found about 1,000 planets in the Milky Way, with just a handful of these thought to be potentially habitable.
But, in the hunt for Earth-like planets, a new study says we should be optimistic - as there may be more than 200 billion in our galaxy alone.
The remarkable declaration is based on the estimate that the average stars has two Earth-like planets in orbit, and the Milky Way has about 100 billion stars.
... they say there are an average of two planets in the habitable zone of each star.
Also known as the goldilocks zone, this is the distance from a star where liquid water, crucial for life, can exist.
The Kepler space telescope is biased towards seeing planets very close to their stars, that are too hot for liquid water, but the team extrapolated from Kepler's results to make their findings.
This would suggest that are hundreds of billions of potentially habitable planets in the galaxy that could support life.However, if so, the scientists wonder "that it remains a mystery why we have still not made contact with an extraterrestrial race, if life is so abundant."
For those who assert that UFOs are extraterrestrial craft, we are visited regularly now, and have been visited in the past. So, is the issue that we haven't been contacted, or that we ignore the evidence of contact.