Hubble has detected the fastest moving hypervelocity star, even faster than the blue stellar torpedoes caught in 2009. This one moves at 1,600,000mph (2.5 million km/h). This is NASA's theory about its origin:
A hundred million years ago, a triple-star system was traveling through the bustling center of our Milky Way galaxy when it made a life-changing misstep. The trio wandered too close to the galaxy's giant black hole, which captured one of the stars and hurled the other two out of the Milky Way. Adding to the stellar game of musical chairs, the two outbound stars merged to form a super-hot, blue star.
Two stars in one, slingshotted from the galactic core by a hungry black hole—I wish we had video of that. It doesn't beat my theory: This thing is running scared shitless from Jean Grey. [Hubble and NASA]