The situation portrayed in the meme above is not remotely plausible. The situation outlined by @Robecology is certainly possible, based on science.

@MojoDave do tell.

We're chillin', @MojoDave, but thinking while we're chllin'....and reading in to the meme message; which is founded in a lot of truth.

@Robecology To my knowledge human DNA hasn't had an injection of alien DNA, ever. It's a funny meme that might scare a bunch of trump supporters. That's all. I do like the situation you outlined elsewhere. That's certainly possible!

@MojoDave Not to my knowledge, either....but when I heard about how our oceans filled up with a "rain of comets" - I did research.

I discovered that to be named a "comet" that they have to be a coma (actually an atmosphere) surrounding a nucleus (up to 99% pure H2O) and a tail (the remains, or leftover "tailing" of the nucleus).

That they are probably extra-solar (from outside our solar system).

That they're mostly large chunks of mostly frozen H20 water (can also be frozen Ammonia and/or Methane). Asteroids are mostly rocky, and mostly formed within our solar system (no tails, no "coma" no eccentric orbits).

It's logical that solar systems within our galactic neighborhood are likely to have formed, including planets with liquid oceans....and then died.

When these systems, or their planets - died, or their oceanic planets exploded, large chunks of their ocean...now exposed to the bitter cold of space - were flash frozen - and set adrift.

Some - in theory - found their way to us.

We're not likely to be the first planet to have evolved life - nor are we the only one - nor the last.

Totally agree

What is woo?

@joeymf86 Woo who!