Question

What must be present for scientists to detect black holes?

.a cloud of dust

. a gamma ray burst

. the loss of a star

.the force of gravity

Answer 1

d

Step-by-step explanation:

Answer 2

D. the force of gravity

Step-by-step explanation:

Black holes are detected as surrounding material (like gas) is funnelled by the force of gravity into a disk around the black hole. The gas molecules in the disk swirl around the black hole so fast that they heat up and emit X-rays. These X-rays can be detected from Earth.