hypervelocity

adj

1. (not-comparable)Having, or occurring at, extreme velocity.

   “The satellite was destroyed by a hypervelocity impact.”

noun

1. A very high velocity.
2. A hypersonic velocity.
3. A velocity greater than escape velocity.

   “But none of those brown dwarfs were speeding along on a trajectory that would carry them out of the galaxy like “runaway” hypervelocity stars observed by astronomers in the last two decades.”