re: #69 freetoken

Proving a negative like that is not something that can be done without testing every possible case in the set, something we can’t do here.

As for your second point - As is in the same column of the periodic table as Phosphorus, indicating As will act similarly to P chemically. Same relationship of Silicon to Carbon, which is why Sci-Fi writers often spin tales of silicon based life forms.

On you last point - this is why the Kepler satellite is so exciting - we will soon have clear evidence of Earth-sized rocky planets in the habitable ( = liquid water) zone of many stars. We will have evidence that our galaxy alone probably has billion of planets existing in habitable zones.

when the Antarctic ice melts, it will blow our minds at the remnants of a previous civilization…bet me