The solar system is our home in space. All the planets and moons within it formed together from a primordial cloud, making them, in a sense, siblings. However, just like these siblings, the planets have very different characters and properties. We humans have only just begun to explore this fascinating diversity: from the enigmatic dense and ancient Mercury to the greenhouse planet Venus, the red Mars, and the gas giants Jupiter and Saturn with their numerous moons, all the way to the mysterious ice planets Uranus and Neptune. Ever-improving telescopes and modern space probes have provided particularly fascinating new insights into our local planetary system in recent years, many of which are surprising and unexpected. This book takes you on a journey of discovery through our solar system and shows what we know today about our planetary siblings.