Multiple choice general knowledge

A planet that was assumed to be closest to the sun but did not even exist actually was called

  1. zeus

  2. promethius

  3. vulcan

  4. apollo

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Vulcan was a hypothetical planet once believed to exist between Mercury and the Sun, proposed to explain perturbations in Mercury's orbit. The planet's existence was disproven by Einstein's theory of general relativity. Zeus, Prometheus, and Apollo are not associated with this hypothetical planet.