One really fascinating thing is that the earliest known life we have on Earth is unexpectedly complex in terms of its DNA. If one looks at how the complexity ev

One really fascinating thing is that the earliest known life we have on Earth is unexpectedly complex in terms of its DNA. If one looks at how the complexity evolved to modern day, and then ectrapolates backwards, it looks like the DNA would have been pretty simple around the time when the universe was still reasonably warm. So, it could have happened that very simple lifeforms formed on somewhere in the early universe and arrived on Earth on asteroids. Kurtzgesagt did a nice video on thus recently. I always thought panspermia was totally ridiculous theory, but there are some nice arguments behind it.