Eric Walker added A Black Hole’s Lunch: Stellar Spaghetti - The New York Times to a number of topics
Eric Walker added These Black Holes Shouldn’t Exist, but There They Are - The New York Times to a number of topics
Eric Walker added Zwicky Transient Facility - Wikipedia to Zwicky Transient Facility (ZTF)
Eric Walker added a number of links to Zwicky Transient Facility (ZTF), and added Zwicky Transient Facility (ZTF) to Observatories and California
Eric Walker added a number of topics to Observatories, and added Observatories to Telescopes, observatories and telescope networks
Eric Walker added a number of topics and a number of links to California, and added California to US states and territories