hypervelocity

1. not comparableHaving, or occurring at, extreme velocity.

   The satellite was destroyed by a hypervelocity impact.

plural hypervelocities

1. A very high velocity.
2. A hypersonic velocity.
3. astronomyA 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.

   2024 August 21, Ashley Strickland, “An unusual object is moving so fast it could escape the Milky Way. Scientists aren’t certain what it is”, in CNN, archived from the original on 24 Sep 2024