Eric Walker added Watch This Black Hole Blow Bubbles - The New York Times to a number of topics
Eric Walker added a number of links to All Sky Automated Survey for SuperNovae (ASAS-SN), and added All Sky Automated Survey for SuperNovae (ASAS-SN) to Telescopes, observatories and telescope networks
Eric Walker added a number of topics and r/geology - The Dee Wright Observatory in Sisters, Oregon. It sits in the middle of a lava flow and made of the rocks it surrounds. to Telescopes, observatories and telescope networks, and added Telescopes, observatories and telescope networks to Astronomy, astrophysics and cosmology and Measuring instruments and measurement techniques