I read many years ago about a theory that small (house-sized) water-ice comets are continually hitting earth--and pretty much instantly vaporizing (theory was disputed then; may have been proven or completely debunked by now idk evidence was spotty at best).

The takeaway is the idea that all of Earth's water may have had extraterrestrial origins, and extraterrestrial water may be continually supplementing our atmosphere.

If that's true, who knows what else might be in those water-ice comets...

The Hollywood classic... "Body Snatchers"

Not since last night, I was floating in the pool before moonrise, staring at the large Magellanic cloud and that was one of the many things that went through my mind.

It is a theory.

Panspermia is the hypothesis that life exists throughout the Universe, distributed by meteoroids, asteroids, comets.

It's a possibility? Not anything that has crossed my mind.

Not lately...but I have...lol.