Back to Article List Photos of Comet ISON For complete coverage of Comet ISON, visit www.Astronomy.com/ISON. By Astronomy Staff | Published: July 8, 2013 | Last updated on May 18, 2023 Key Takeaways:
Exotic Objects, Stars ‘Strange binary’: Astronomers discover a pulsar and a helium star orbiting each other
Robotic Spaceflight, Science How a signal from a 60-year-old satellite baffled astronomers for over a year