Birth of a Forbidden Planet: Rising from the Ashes of a Star

Astronomers have discovered a "forbidden planet" called Halla, which is orbiting a dying star. Halla's star has already consumed its available hydrogen and is currently fusing helium. The planet's existence is puzzling because it should have been swallowed when the star expanded in the past. Possible explanations include Halla orbiting a binary star system that merged into a single star, or Halla being a second-generation planet formed from the debris of a stellar collision. The discovery highlights the strange and unpredictable nature of the universe.