Black holes,by definition,cannot be observed directly.What observational evidence do scientists have of their existence?
A)Theoretical models predict their existence.
B)Gravitational interaction with other objects.
C)Space is,overall,very black.
D)We have sent spacecraft to nearby black holes.
E)We have detected neutrinos from them.

Question

Quizplus · Accepted Answer

The strongest observational evidence of the existence of black holes comes from their gravitational interaction with other objects. Scientists can observe the effects of black holes on nearby stars and gas, and can use this information to infer the presence of a black hole even if it cannot be directly observed. The other choices are not directly observational evidence of black holes, but rather theoretical predictions or indirect detections.

Black Holes,by Definition,cannot Be Observed Directly