I have no idea why that would be a mathematical certainty. It's been shown there are over 20 very finely tuned environmental factors (temperature, gravitational pull, radiation levels, etc.) necessary for life here. The odds that even 10 of these factors would randomly occur on any other planet is a number larger than every grain of sand on earth times 10 to the 20th power.
I said a NEAR mathematical certainty but even given your 20 requirements for life here doesn’t mean other life in other places is dependent on the same conditions.
If time has taught us anything it is that the more we learn the more we realize how much we have to learn.
Some people set every factor in the Drake equation to zero. It certainly simplifies the calculation.
Of course, if they all really were zero we wouldn’t be here either...
Interesting that you decry someone’s assertion with another that’s totally bogus, i.e., “The odds that even 10 of these factors would randomly occur on any other planet is a number larger than every grain of sand on earth times 10 to the 20th power.”
Let’s start with the “20 factors” you claim necessary; what are they? How did you calculate the number of grains of sand on Earth (and you’re really going to have to show your work on this one)? Then, by what method did you arrive at your statistical analysis claiming that 1/n sub s (number of sand grains on Earth)*10^20 represents the likelihood of only half of the factors (not) identified would be present?
And that's just to support life. There is zero change if life spontaneously springing into existence in any imagined environment.
I do not believe that is really true.
Life is found on earth in many unusual places, completely unsuited for organisms which inhabit other places. For instance, the colonies of life forms found at undersea vents.
We have already demonstrated that life can persist in zero gravity on the space station. We have also demonstrated that at least some forms of earth life can reproduce in zero gravity.
No, we are not going to find an exact duplicate of earth, but places where life can exist are going to be plentiful, just because there are so many planets in the universe.