Comet 21/Borisov, an interstellar object it is thought, is uniquely pristine we are told – see https://phys.org/news/2021-03-interstellar-comet-pristine.html … Discovered by amateur comet searcher Gennady Borisov, back in 2019, has been confirmed to have an origin outside our solar system. See www.nature.com/articles/s41550-021-01336-w … for further enlightenment.
At https://phys.org/news/2021-03-astronomers-black-hole-x-ray-binary.html … an international team has been monitoring radio and x-ray signals from a black hole. It is thought to be what is called a black hole x-ray binary and is tagged as MAXI J1348-630. Observations, they hope, will tell them more about the compact and transient jets emanating from it. See https://arxiv.org/abs/2103.12190 for further information and how to get the full text version if desired. What is being talked about here is a binary system of a black hole with a secondary companion, a low mass evolved star.