So recently NASA discovered a remnant of a potentially crashed alien ship on Mars. Oumuamua was clearing acting like of intelligent origin. Saturn's moons possibly have rich life forming oceans underneath all the ice.
Now with all the talk of UFOs, just to rule out that our "phenomenon" is not...
life on earth evolved as per the doctrine and suitable to meet the acceleration due to gravity which stands at 9.8 m/s2 (second squared) ... this much gravitational pull suffices to hold and nurture an atmosphere which is conducive to life over some millions of years of evolution ...
life on...