How do you explain the fact that finding another planet as our Earth is so hard to achieve?
Life as we know it can only exist when under certain precise conditions: a rocky world containing heavy elements revolving in a stable, circular orbit at just the right distance from a stable, long-lived star like our sun, in a particular region of its galaxy far enough from the center so the planetary system won’t be scrambled by other nearby stars or fried by nearby supernovae. Lately some have said that our moon is essential too, stabilizing the earth’s rotation so it maintains its axial tilt instead of flipping back and forth, which would cause death-dealing climate shifts. Also, Jupiter is given credit for keeping the inner solar system free of too many asteroids which could smash into us more often than they do. This is quite a combination of lucky accidents, and makes the existence of other truly earth-like planets a very small probability. Even if you do get another earth, the right chemical accidents have to occur in order for life to get started and *maybe* produce intelligen
