(star moving very much faster than usual)
A hypervelocity star is a star moving much faster
than its neighbors, i.e., whose velocity stands out
from the distribution of velocities of its neighbors.
A typical star's velocity relative to its neighbors is
on the order of 100 km/s whereas a
hypervelocity star may have a velocity of 1000 km/s
or more, possibly even beyond the escape velocity
of the galaxy. Many are thought to come from the
galactic center, but some may be from outside
The first hypervelocity star was identified in 2005.
On the order of 30 have been identified and the
Milky Way is presumed to have on the order of 1000.
The nearest known example (HVS 2) is about
19 kpc from the Sun.
(star type,stellar kinematics)
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