Earth isn't flat - but it is not exactly round either! The actual shape of our planet might surprise you... Made in partnership with The Royal Society. #BBCIdeas #Earth #Science #Universe #Space | BBC One

Have you ever asked why the seasons change? It's not because of Earth's distance from the sun, it's because of Earth's tilt. Our planet is tilted about 23.5 degrees on its axis, which means different parts of Earth receive varying amounts of sunlight throughout the year. When the Northern Hemisphere tilts toward the sun, it's summer there, while the Southern hemisphere experiences winter and vice versa. Without this tilt, we wouldn't have seasons at all. The climate would stay nearly the same ye