[quote]There are MANY FACTORS which determine whether or not a planet will be inhabitable. There is a reason why Earth is the perfect distance from the sun so it isn't too hot, nor too cold, but just the right temp to sustain life. [/quote]
Sustains life as we know it.
There is nothing to say that other forms of life aren't capable of living under entirely different circumstances.
Exactly.
[i]life as we know it[/i] means carbon based lifeforms that we are/know of
It is entirely possible that there could be lifeforms based off another element like nitrogen.