What are seven classical planets?

There are seven classical planets that people used to think were the only ones circling the Sun, just like how you might count your favorite toys when playing.

Imagine you're looking up at the sky on a clear night, and you see some bright dots moving across the stars. Those are planets, and in ancient times, people noticed seven of them: Mercury, Venus, Mars, Jupiter, Saturn, the Moon, and the Sun itself. They thought these were special because they could be seen without any tools, just like how you can spot a shiny toy in the dark.

The word classical here means “old-fashioned” or “traditional.” These seven planets were known to ancient civilizations, like the Greeks and Romans. They gave them names after gods and goddesses because they thought the planets had special powers, kind of like how you might name your favorite toy after a superhero.

But now we know there are many more planets out there! It’s like finding new toys in your room when you thought you already counted them all.