Figure 1: Molecular Cloud Barnard 68: A small molecular cloud, or Bok globule, of about 2 solar masses, at a distance of about 500 light-years, and about ½ light-year across, yet not a single star can be seen in it. That means there are no stars between the sun and the cloud. It absorbs all light from the background stars, hence is optically thick. (Illustrated on page 409 of Carroll & Ostlie, 2nd Edition) Credit: FORS Team, 8.2-meter VLT Antu, ESO
Dr John G. Hartnett is an Australian physicist and cosmologist, and a Christian with a biblical creationist worldview. He received a B.Sc. (Hons) and Ph.D. (with distinction) in Physics from The University of Western Australia, W.A., Australia. He was an Australian Research Council (ARC) Discovery Outstanding Researcher Award (DORA) fellow at the University of Adelaide, with rank of Associate Professor. Now he is retired. He has published more than 200 papers in scientific journals, book chapters and conference proceedings.