There is no known calculation that can realistically predict the chance of life not on earth. My opinion is that we are almost certainly not alone. We have already discovered several planets that have the right make-up to support life. And this is from sampling just a small portion of the universe. Aliens have probably not been to earth yet, but I wouldn't be surprised if they have. The sightings of UFO's definitely make me wonder.
Those planets do not have all the requirements for life. They only have an infinitesimally small fragment of the requirements.
I once sighted what I and a friend just knew for certain was an alien spacecraft coming in for a landing. And then the clouds slowly disappeared and we saw a full moon that previously we thought was getting larger and larger because we assumed it was getting closer and closer.
Many false appearances have been balloons.
I even knew of some guys on a ship that floated lights attached to balloons at night to fool other ships into thinking some sort of UFO was there.
Test flights of aircraft under development have fooled people.
Ignorant people have the wildest fantasies.
There is zero evidence of UFOs or aliens. ZERO
Now, just look at the requirements that I laid out and ask me about any of them.
The iron core is needed along with a spinning planet to set up a magnetic field to ward off scouring solar radiation and will offer zero protection from scouring gamma rays even rays broadcast from Billions of light years away.
You'll also need a hot center such that volcanic activity will be present. We've had volcanic activity that has wiped out most of Earth's life in the past not to mention asteroids that have missed being sucked in by Jupiter and hit us destroying most of life on multiple occasions.
No, the probability is effectively zero.
Do the calculations yourself.
Ultraman
