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Mercury

  • What color is Mercury?
  • Is there any water on Mercury?
  • How long does it take to get to Mercury from Earth?
  • How did Mercury get its name?
  • Who discovered Mercury?
  • How many spacecraft have been to Mercury?
  • How old is Mercury?
  • What is Mercury made of?
  • What does the Sun look like from Mercury?
  • What is the weather like on Mercury?
  • Does Mercury have an atmosphere?
  • How far is Mercury from Earth?
  • How long is a year on Mercury?
  • How long is a day on Mercury?
  • How fast does Mercury orbit the Sun?
  • How close is Mercury to the Sun?
  • How strong is the gravity on Mercury?
  • How small is Mercury compared to Earth?
  • Why does Mercury have more craters than the other planets?
  • How hot is Mercury?

How long is a day on Mercury?

A planet's day is the time it takes the planet to rotate or spin once on its axis. Mercury rotates very slowly compared to Earth so a day on Mercury is much longer than a day on Earth. A day on Mercury is 58.646 Earth days or 1407.5 hours long while a day on Earth is 23.934 hours long.


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