[Delta 21]

I dont believe you.

The earth has never nor will ever be in the same part of space that it has been in in the past. The entire solar system is being drug along in the suns gravity wake whilst it orbits the center of the galaxy.

Time travel is impossible for this reason. The old clock tower in the city square of Hill Valley just aint where it used to be!

[Getready]

...and the whole galaxy itself is expanding outward also? Have the astrophysicists pinpointed the section of the universe where the cosmic egg exploded into being? One would think that all we gotta do is track the expansion paths of all the galaxies and extrapolate back to the point of origin...no?