Earth is the only planet in our solar system not named after a Greek or Roman god.

Ancient astronomers named the planets they could see after gods based on how the planets looked. Mercury moves quickly, so they named it after the fast messenger god. Venus is very bright, so they named it after the goddess of beauty. Even planets found much later, like Uranus in 1781 and Neptune in 1846, were given names from mythology to keep the tradition going.The name Earth comes from the Old English word 'eorthe' and the Old Saxon word 'ertha.' These words mean soil or dry land. Early people did not realize Earth was a planet moving through space. They saw it as the solid ground beneath their feet. This is why they used a descriptive word instead of a religious one.In Roman mythology, the goddess of the Earth was called Tellus. The Greeks called her Gaia. While these names are sometimes used in science, they never became the common name for our home. The idea of Earth as a planet like the others only became popular in the 1500s. By then, the name Earth was already well established.The International Astronomical Union (IAU) is the group that manages official names for objects in space. They kept the name Earth because it had been used for over 1,000 years. The word 'world' has a different history. It comes from old words meaning 'the age of man.' This shows how humans once viewed Earth as a place for people rather than a ball of rock in the sky.