Are there evidences supporting directed panspermia hypothesis?
Are there evidences supporting directed panspermia ..
Panspermia is the term for the most scientifically plausible version of this concept, but it isn't necessarily what science fiction usually presents. The panspermia hypothesis holds that the building blocks of life are not found exclusively on planetary bodies but are instead found scattered throughout the cosmos, and it is these spaceborne particles that are at least partly responsible for life on Earth. There's for the theory (although far, far more to support the reliable old "Life comes from Earth" hypothesis), and there is something undeniably fascinating about the subtext – the aliens are already here, and we are they. But science fiction barely ever depicts the actual theory of panspermia, mostly because it's just a physical process that takes billions of years to play out and is pretty boring unless you're willing to get really mystical.
Panspermia theory claims life on Earth ..
What science fiction more properly deals with is exogenesis, which simply states that humanity or its genetic ancestors didn't always live on Earth. That generally means one of two things – either an ancient alien race introduced life to a previously dead Earth (sometimes as part of a larger directed panspermia project) or a bunch of humans from some other civilization colonized Earth, a fact that somehow slipped the minds of their descendants (you know…us). Plenty of science fiction deals with both, including two of the big science fictions works currently in the news. (The occasional spoiler may lie ahead.)