Black star
A black star is a stellar object which has high gravitational attraction. Black stars can remain undetected until encountered by entering their gravity field.

In 2267, the , en route to Starbase 9 for resupply, became caught in the gravity well of a previously-uncharted black star. The Enterprise was able to break away by using all warp power in reverse, but the resulting whiplash effect propelled the ship into a time warp. The ship arrived in a low atmospheric orbit around Earth in the late 1960s, as the Sol system was located in the heading they were pulling away to. ()

See also
Black hole
Dead star

External link
 

de:Schwarzer Stern
ja:ブラックスター
Celestial objects
Time travel