[bnegreve]

> Probabilistically unlikely for us to be the only ones, but just a thought.

How do you even measure that? If the number of coincidences required for life to emerge is large enough, the probability of observing life on a planet could very well be far bellow 1 over the number of planets in the universe.

That would make us probably alone :(

[OscarCunningham]

One point of evidence to the contrary is that life appeared on Earth nearly as soon as it could. So it seems that given the correct conditions on a planet abiogenis always occurs.

[glitch003]

>How do you even measure that?

Probably like this: https://en.wikipedia.org/wiki/Drake_equation

[bnegreve]

The probability I was referring to is fl " in Drake's equation ("the fraction of planets that could support life that actually develop life at some point"), and Drake isn't really helping us here.

Quoting wikipedia:

The last four parameters, fl, fi, fc, and L, are not known and are very difficult to estimate, with values ranging over many orders of magnitude

[fit2rule]

So far we know its true of the solar system, at least.

Which means there's no really good reason we can't move our factories to space and turn Earth into a Life Haven.