Carl Sagan famously said, “The cosmos is all there is, all there was, and all there ever will be.”

The irony is that each of those statements is philosophical, not scientific.  He merely tipped his hand for all to see.

The cosmos is all there is

No scientific evidence for that. 

all there was

No scientific evidence for that. 

and all there ever will be.

No scientific evidence for that. 

They say that Carl Sagan didn’t believe there was a God.  He does now.

UPDATE: Bubba made a good point in the comments section about the definition of cosmos (“the world or universe regarded as an orderly, harmonious system”).   Another irony is that as science demonstrates more and more spectacular fine-tuning of the universe, desperate materialists are having to posit the pathetic “multiverse” theory to prop up their worldview.  This is in direct conflict to all of Sagan’s erroneous statements and is just as unsupported factually.