Scientists explore the connection between black holes and neutron stars .
Black holes are deep wells in the fabric of space and time.
They have such immense gravity that nothing, not even light, can escape them. A black hole seems to be the study of the invisible. A black hole's rotation twists the fabric of space and time. As material crowds in through the flattened accretion disk, some gases are squeezed outward to become superluminal jets. To get around this problem, astrophysicists study other high-energy phenomena that are associated with black holes.