As time went on and telescopes got better and better each new century brought with it the discovery of a new planet.
Which brings us to this familiar solar system: nine planets orbiting one star.
And looking at this model makes people wonder, why do astronomers want to ditch Pluto?
The problem is pictures like this in textbooks are lies. Well, not lies exactly, but unhelpful. They give the impression that the planets are similar-ash in size and evenly-ish spaced, but the reality couldn't be more different.