EDIT 11/7: I've added the flashback before and during the journal voice over, but I'm contemplating taking the voice over out... Need input.
We start on a MCU of test tubes bubbling...
Sets it down onto a locket. CLANK
Picks it up. A moment of reminiscence. We dissolve to:
Otto looking up at the moon.
He begins to write: it's been 70 years since my parents told me Diana got sick went to the moon to get better."
"...this is my last attempt to find her" (Otto studies the astronomy book alone under their favorite tree).
And crosses off Diana's name from their rocket.
And then into the rocket! Otto presses buttons, etc.
Where Diana's name is engraved.