A black hole has never been seen directly. There are always clear indicators of a black hole at work. For instance, this image released by NASA shows a swirling whirlpool of hot gas.
Studies of the bright light emitted by the swirling gas frequently indicate not only that a black hole is present, but also likely attributes. The gas surrounding GRO J1655-40, for example, has been found to display an unusual flickering at a rate of 450 times a second. Given a previous mass estimate for the central object of seven times the mass of our Sun, the rate of the fast flickering can be explained by a black hole that is rotating very rapidly. What physical mechanisms actually cause the flickering — and a slower quasi-periodic oscillation (QPO) — in accretion disks surrounding black holes and neutron stars remains a topic of much research.
Combining years of neurological research and mindfulness techniques, Dr. Heather Berlin helps us better understand how the body’s most complex organ can easily be misled into negative thinking - and how we can stop that from happening.