Twilight Sparkle was only a filly when Equestria detected the enigmatic Signal. A series of increasingly complex mathematical proofs, the Signal transformed from an intriguing curiosity to reliable evidence of extraequestrian life.

And as it happened, Equestria's exploration of their own solar system was nearly complete. With colonies orbiting every planet and large body, and an asteroid belt filled with miners and prospectors, Twilight's civilization was just about ready to turn its focus outward. The signal was less than ten light-years away, within reach of a daring, experimental voyage. A voyage Twilight Sparkle would lead.

Along with a small crew of the most skilled scientists and engineers Equestria could offer, Twilight is determined to uncover the mystery of the Signal, and brave the final frontier for future generations of Equestrian explorers.

A comment-driven, CYoA story. Please use the links provided in the author's notes of each chapter to vote, rather than the comments.

This story is a creative experiment of mine, one meant to explore the general idea that creativity is often most fostered by restrictions. As a result, I've imposed a number of restrictions on the writing of this story, which I'm stating explicitly here so I can be called out if I break any of them.

1. Brevity is the soul of wit
No chapter may be more than 1000 words long. This wordcount only includes prose, and not the questions/rolls.

2. Every choice matters
When a choice is offered in a chapter, at least one sub-optimal choice must be present, with no indication about which is which other than the prose itself. Every chapter should end with a CYoA-style decision tree when possible.

3. Fate is cruel and the universe is heartless
The decision of the vote must be respected. This means any character could be killed, or the entire story could end in failure, if that's what the votes decide. Where numbers, stats, and randomization appear in the text, these elements are not verisimilitude, but are decided by public diecrolls in my discord server.

Note: Because of the unusual production of this story, its chapters won't be edited in the same way as my usual fare. Feel free to point out any mistakes you encounter.

Awesome cover by Zutcha as you can probably tell. Editing stuff by Two Bit and Sparktail, where applicable.

Isolated from her friends and taken prisoner in the middle of a war, Twilight must deal with the very real dangers of being percieved as an enemy as well as the nightmares of her arrival on 'Earth'. Can she overcome her own fears and the fears of her captors? Will the wayward unicorn's assistance be a boon or a curse to the 'humans?' Most importantly, will she ever find her way home?

"In short, it's a story of friendship and plasma rifles, with the emphasis on the friendship. The characters are well written, the XCOM setting is fleshed out very well, and the story is compelling. If you love XCOM, you'll love the story, but even if you've never heard of it, it's more than worth giving the first 3 chapters a read.

There's excellent action later on, but the real strength lies in the collision between the friendly and naive world of Twilight Sparkle and the desperate world of humans fighting a losing war for survival and willing to do anything to turn the tide."

--Arzoo

(XCOM/FiM crossover)
(Cover art commissioned by a friend and created by the magnificent FoxInShadow!)
(Original cover art by the amazing Carnelian can be viewed here!)
(Gore tag for blood and some violence)
(Many thanks to the studius OminousTen, Arzoo, xXFluttershyForeverXx and finally Setokaiva for giving my rambles a once-over)
(Now with it's own TV Tropes page! Get to tropin' folks!)

This story is a sequel to Stardust

Times are changing for Equestria as Twilight’s return brings with it news of people and cultures from beyond the peaceful world everypony knows. Aid and volunteers are freely offered to help the besieged humans of Earth because every Equestrian knows that’s what good friends do. Unfortunately, making friends can also have the unintended consequence of making enemies.

When the monsters besieging the humans strike at Equestria with a level of brutality not seen in over a thousand years, the cry for help is sent to all the kingdoms of the world. Honored allies step forth to fulfill ancient treaties and oaths. Enemies, old and new, bury their grievances. An alliance never before seen in Equestria will be created to combat the monsters from the void.

And because of these events, a grim but welcome sibling to the XCOM project is born.

(XCOM/FiM Crossover)
(Sequel to Stardust, which I recommend reading before starting this. Fortitude Amicitia and Broken aren't required reading but are supplemental to the storyline)
(Gore tag for blood and violence)
(Alternate Universe tag because of the divergence from canon that Stardust has caused)
(Uses elements of Season 4)
(Coverart produced by the amazing Carnelian!)
(Many thanks to Arzoo, BradTheBrony, Vandenbz and Setokaiva for prereading!)
(As of 03/07/2016, the prereading team consists of Arzoo, BradTheBrony, Noble Cause and Metallusionsismagic!)
(Complete with it's own TVTropes page as part of the Stardust continuity. Could use some updating!)
(Character tags will be added as chapters are added!)
(Featured 5/12/2014! Thanks folks!)
(Possible spoilers in the comments! BEWARE!)

The Princesses find an alien creature barely clinging to life at the scene of a terrifying crash. Can the Combined Power of the Elements of Harmony save it, or more importantly, should they save it? Will the arrival of this strange creature tear Equestria apart?

TV Tropes
https://tvtropes.org/pmwiki/pmwiki.php/FanFic/Article2

This story is a sequel to Changeling Space Program

Twilight Sparkle's experimental interplanetary drive has malfunctioned, stranding Starlight Glimmer, Spitfire, Cherry Berry, a changeling and a dragon on a hostile planet in another universe. With limited food supplies, very little magic, no communications with home, and no way to leave the planet, they must survive until somepony rescues them.

Fortunately they crashed right next door to another creature with the exact same problem- a creature named Mark Watney.

They're going to science the buck out of everything- and do whatever it takes to survive Mars and get everybody home.

TVTropes page here! Thanks to GymQuirk for making it!

Commissioned art and fan works from the readers! Thanks, everybody!

This experiment in an updates-daily story was made possible by a generous grant from Canary in the Coal Mine and viewers like you.

(Sex tag for crude talk about sex, but no actual sex in the story.)