If so, alien artefacts may be found all around the Solar System and possibly on Earth.
Nearly likely.
Our small section of the universe is not particularly unique considering how big and old it is.
If life began here, it most likely began elsewhere as well.
Remember that this is a very general assumption.
It would only take one petrified archaebacteria-like organism five superclusters away to confirm the existence of alien life,.
The best approach to look for extraterrestrial life is to stay at home and look for "techno-signatures" .
What exactly are they?