That's literally the Internets new favorite "montage soundtrack". I hear it on as many videos today as we did of the Requiem for a Dream theme that plagued (great song, beaten to death) the internet for several years.

The music is "Adagio in D Minor" by John Murphy, from the soundtrack of the excellent movie "Sunshine". I have to say, I really hate hearing it (ab)used so freely (in Fringe, Kick-Ass, the trailer for The Adjustment Bureau, The Walking Dead, etc.). I get the same uneasy feeling when hearing Mansell's Requiem for a Dream theme in other films; when music is written for a film, it is a part of it.

/end rant.

edit: sorry RFlag, didn't see you had already thoroughly answered.

This and the Requiem for a Dream theme.