Back to the Future: Does physics of Marty's time travel add up?

Today is 21 October 2015 – the date Marty McFly and Doc Brown travel to in Back to the Future Part II. Can we reconcile the films with reality?

Is time travel possible?

Escaping the 'Grandfather Paradox'. Quantum Mechanics may provide a solution to the puzzles of time-travel, by Robert Lea

This amazing new physics theory made me believe time travel is possible

Time travel is possible, but it's a one-way ticket – ScienceBorealis.ca Blog

Back to the Future: Does physics of Marty's time travel add up?

100+ Best Time Travel Movies – Creepy Catalog

Back to the Future Part III (Film) - TV Tropes

Back To The Future's Time Travel Explained: How It Works & Is It Accurate?

124 Solo: How Time Travel Could and Should Work – Sean Carroll