“In terms of what we now know regarding the possibilities of Multiple Universe theory then the whole “grandfather paradox” is nul and void, meaning time travel IS on the table”
Believe the theory is called the Multiverse Theory.
There’s also the Omniverse Theory (believe this one was coined by activist, international lawyer, founder of the Exopolitics concept and later the Exopolitics Institute, Alfred Lambremont Webre).
Things (everything, even time as we know it) are moving much, much faster now than just a couple of decades ago!
I like to point out that some 25 years ago or so, the mainstream scientific community (Astronomers in this case) categorically denied the possibility of other planets orbiting other stars (but there are Billions of them in our Milky Way Galaxy alone!), implying that our solar system would be the only one around (this, in a Universe where there are many Billions of other galaxies!), having planets, moons, etc.
Well, first with Hubble, now Kepler, and soon the James Webb Space Telescope, all those “scientific certainties” are being totally washed out!
Kepler alone has found more planets orbiting their own stars then the most prolific sci-fi authors could even imagine!
To the point that only in 2-3 decades the theories are now the exact opposite, and the conclusions are that almost certainly every single star we see in the night sky has its own group of planets orbiting it!
That makes the Drake equation much more plausible, and with all the new data the possibilities of intelligent life out there have significantly increased… (that is for the mainstream, the skeptics, the deniers… others know this Universe is teaming with intelligent life, and we are visited every single day, every single night!… after all, if indeed our solar system is around 4 billion years old, and if indeed this Universe is around 14 billion years old… just imagine how many Civilizations out there may have formed in that 10 billion years gap!…)