Black Holes and Dark Matter

26 Feb 2021

There is a sort of obsession with black holes by some astronomers and cosmologists. It may go back to their childhood and stories of dense black holes swallowing all kinds of things, from spaceships to gorgons. At https://phys.org/news/2021-02-supermassive-black-holes-dark.html ... well, black holes are traditionally dark places, but has it got anything to do with dark matter [which is also, apparently, very black and difficult to spot]. A new theoretical study, we are told, has proposed a new idea for the formation of black holes as the discovery of them in the early universe has confused the sky community. How could they form so quickly after Big Bang. We now have the idea that dark matter is responsible for the creation of these early black holes. In conventional wisdom, we have been told for a number of years, black holes are derived from normal baryonic matter collapsing under gravity to form black holes [dense matter]. Now we have dark matter implicated. Needless to say the findings came out of the orifice of a model. By injecting dark matter into the model and gyrating the computer simulation it is no surprise that dark matter came out as the villain -or is it a hero. What goes in is regurgitated at the other end. That is all models are. If it had not factored in dark matter the result would not have involved dark matter.

At https://phys.org/news/2021-02-parker-solar-probe-stunning-view.html ... the Parker Solar Probe has beamed back stunning images of Venus. The probe zipped by Venus and took the images even though its primary mission is the study of the surface of the Sun.