Was life on Earth seeded?

[Halichoeres]

This paper is pretty technical, but it reviews evidence in support of the hypothesis that Earth was always pelted by virus- or bacteria-bearing rocks, and that they were able to kickstart life as soon as conditions on the ground (or in the puddle, whatever) were suitable. This is a question that probably won't be answerable for certain until we can sample microbial life from other parts of the solar system or universe, but really interesting ideas.

Open access (in the US at least):
https://www.sciencedirect.com/science/article/pii/S0079610718300798

[Mini Minmi]

So technically, we are aliens... 

I had heard of this before, it's great to have access to a formal paper about it. Thanks for sharing!

[Reptilia]

If life on Earth was seeded it's reasonable to think that the same process must have happened in other corners of the universe, among countless planets there must be some with the same starting conditions of ours.

[Neosodon]

What I found most shocking was that gases from organic decay can be observed on comets. It's pretty amazing they can even tell that kind of stuff. Pretty incredible what science can figure out now days.