Princess Twilight Sparkle, in a new, peaceful era for Equestria, has gotten bored of just reading. No- she wants to discover for herself. Only, Equestria has run out of discoverable facts.

Then Princess Luna reveals an astounding fact to the younger princess. A few observations and a little engineering later, and she's ready to blast off for the stars.

Only, before she even breaks out her contraption, a computer glitch leaves something else to investigate- something far closer than the stars, yet something that might reveal the secret of the stars to her.