Question: An isolated black hole in empty intergalactic space would be difficult to detect because there would be no stars behind it whose light it could

An isolated black hole in empty intergalactic space would be difficult to detect because
there would be no stars behind it whose light it could bend or lens gravitationally.
it could not emit light from inside its event horizon.
no companion stars would be affected by its gravitational field.
no matter would be falling into it to create an x-ray emitting accretion disk.
all of the above
An isolated black hole in empty intergalactic

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