and McKay's?The evidence is just getting stronger and stronger...I think anybody looking at this evidence is going to say, 'There's got to be life out there.'
It's true that they use different words. Pilcher says "evidence", McKay says "real things we can point to".There are real things we can point to and show that being optimistic about life elsewhere is not silly.
But isn't that what "evidence" is -- real stuff you can point to that show a particular view is not unreasonable?
There is a subtle, but important difference between evidence and proof...
Evidence "is information that helps form a conclusion". Proof is "factual information that verifies a conclusion". (From http://www.thefreedictionary.com/evidence)
Do you disagree with these definitions of evidence and proof? If so, may I see your definitions?