Skip to content
Curated category

Hypothetical astronomical objects

  • MultiverseIn the sixth century BCE, the pre-Socratic Greek philosopher Anaximander first suggested that infinite worlds might exist.
  • Planet NineIn 1846, astronomers discovered Neptune after noticing irregularities in Uranus's orbit. This discovery sparked speculation that another planet might exist…
  • Vulcan (hypothetical planet)In 1611, the German astronomer Christoph Scheiner reported seeing dark spots on the Sun. He believed these were small planets orbiting closer to the star…