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...
...and move through them to a glowing/sparkling rock...
...past that and over stacked crates...
To Otto, who is writing. He grabs his cup and drinks.
Sets it down onto a locket. CLANK
Looks down to see the locket.
Picks it up. A moment of reminiscence. We dissolve to:
10 year old Otto's hand holding the locket (NOTE: It has changed to a moon locket).
He puts it around Diana's neck.
Then we see memories. They read an astronomy book under an oak tree.
They make a play rocket out of a crate
They star gaze. Then we dissolve back 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."
While he writes we dissolve again to Otto's parents giving him back the moon locket.
"...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.
"I'm headed for the dark side of the moon." (Otto moon gazes alone).
We dissolve back to Otto signing his name."Otto Albertovich Numerov, June 1918"
With effort, Otto gets up and starts walking
Goes through a hatch to his rocket.
Cut to a serene exterior view
And then into the rocket! Otto presses buttons, etc.
And off it goes!
And down the hill we go to a graveyard...
Where Diana's name is engraved.