1- Mounting evidence indicates there are interstellar visitors; some of the visitors may not be interstellar (see Tom van Flandern's exploding planet hypothesis)2- Since humankind do not have the 'final set of equations' incorporating a better understanding of Time, and our attained level of Physics understanding and application may yet be rather primitive to a civilization whose technology is a couple of thousand years ahead of our own, it is an oblique assertion to claim there are hurdles for interstellar travel to such more advanced beings; at our present publicly held level of Physics conceptualization the hurdles for us are insurmountable ... for now.
1- Mounting evidence indicates there are interstellar visitors; some of the visitors may not be interstellar
***As my anti-LENR adversaries are so fond of pointing out, where is the peer-reviewed evidence? Where’s the alien body I can examine for myself?
- Since humankind do not have the ‘final set of equations’ incorporating a better understanding of Time, and our attained level of Physics understanding and application may yet be rather primitive to a civilization whose technology is a couple of thousand years ahead of our own
***And it may not be at all. You have no idea, because there is no evidence of such a technologically advanced civilization. It is an invalid argument from silence. It also violates Ockham’s Razor.