An invisible monster supermassive black hole is feared to be skulking around intergalactic space.
Investigating NASA experts say its incredible speeds - which would take it from the Earth to the Moon in less than 15 minutes - means it is not destroying stars as other black holes have been seen doing.
Instead, the mass has left behind a 200,000 light-years-long line of newborn stars as it billows through galactic gases.
