How did River Song know to go to Earth after the events of The Big Bang?

How did River Song know to go to Earth after the events of The Big Bang?

In The Big Bang (the concluding episode of the Pandorica arc), the Doctor is erased by the cracks in space-and-time. Yet Amy brings him back by remembering him, which is triggered by River Song dropping off her diary with Rory and then walking past the window. Since the Doctor never existed at that point, what made River Song go to Earth and drop off a blank diary with a random stranger?

Solutions/Answers:

Answer 1:

Spoilers for S6E7, A Good Man Goes To War:

River, being part-Time Lord, probably is capable of remembering people after they’re consumed by the crack. She didn’t mention this detail in The Big Bang, as it would reveal too much about herself too soon. After the universe was restarted, she remembered the Doctor, and had her journal/diary although the writing in it had been wiped as it no longer happened. So she left it for Amy as a reminder of the Doctor, just like the ring had previously reminded her of Rory.

Answer 2:

Likely the same way that the Doctor was able to hide Amy’s memories of him in the wedding expression (“Something old, something new, something borrowed, something blue…”) despite the fact that at at the time she starts to remember him, he would never had existed to create or hide those memories in any way.

That is to say, impossibly. Perhaps the Doctor managed to hide memories for her as well, albeit less important ones. All he had to do for River is make her remember to drop off a blue journal; Amy’s hidden memories had to bring him directly into existence.

On some core level, considering it was possible for him to be remembered back into existence at all and the fact that the Universe corrected itself after his re-appearance (River’s journal filling back up, etc.), it seems likely that he never entirely ceased to exist (the same way Amy had dormant memories of Rory after his “non-existence”). However, it seems the one thing that was not corrected was Rory’s memories of being an Auton, as the real Rory was brought back and married Amy (but still remembers those years).

See http://tardis.wikia.com/wiki/The_Big_Bang and http://tardis.wikia.com/wiki/Rory_Williams for details.

Answer 3:

I assumed River would have been there because it’s her parents’ wedding and therefore was always there in any version of reality. In the rebooted reality though, she left her blank diary to subconsciously help Amy remember the Doctor.

Answer 4:

duh……River was that black girl growing up with them so she knew they where getting married. That is why she is there.

References

Where did The Doctor get his Psychic Paper?

Where did The Doctor get his Psychic Paper?

Every episode of Doctor Who I've seen shows him with the Psychic Paper. Does it ever discuss how/where he got it?

Solutions/Answers:

Answer 1:

The Second Doctor was given psychic paper while employed as an agent by the Time Lords’ covert organisation, the Celestial Intervention Agency. The CIA had developed the technology. (PDA: World Game)Psychic Paper

Psychic paper is a piece of psycho-interactive material that affects the minds of people who see it. The paper makes them believe they are seeing the identification of a person of authority, usually cued by the suggestion prompted by the agent using it. The paper would work on most minds but was unable to affect those of a genius intellect. It has reappeared in the series commonly used by the Ninth, Tenth, and Eleventh incarnations of the Doctor. It can be used as a credit card, an ID for an electronic system (no idea how THAT works) or a keycard. The Doctor has used it to send messages through time, though the results vary widely.

It is one of the two most common hand props of the Doctor. The other is the sonic screwdriver. Psychic paper was seen onscreen in the episode “The End of the World” written by Russell Davies broadcast April 5, 2005.

References