Pluto is no longer considered a major planet (it’s a dwarf planet).

Venus, not Mercury, is the hottest planet due to thick clouds.

Saturn is not the only planet with rings—others have them too.

Mars is red because of iron oxide, not because it’s hot.

Jupiter’s Great Red Spot is a storm, not a landform.

Uranus spins on its side—this is unusual in the solar system.

The Sun is a star, not a planet.

Planets don’t glow—they reflect sunlight.

Not all planets have solid surfaces (gas giants don’t).

Day and year lengths differ on each planet due to rotation and orbit.