The fourth planet from the Sun is Mars.

Quick Scoop

  • The order of the planets from the Sun is: Mercury, Venus, Earth, Mars , Jupiter, Saturn, Uranus, Neptune.
  • Mars is often called the Red planet because iron oxide (rust) on its surface gives it a reddish color.
  • It is a rocky planet, smaller than Earth, with a thin atmosphere and polar ice caps.

In short: when counting outwards from the Sun, Mars comes fourth, right after Earth.

TL;DR: The answer to “what is the fourth planet from the Sun” is Mars.

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