They learnt that even though Mercury is the closest planet to the Sun, it is not the warmest. In fact, they learnt that Venus is the hottest planet.
The ring around the planet Saturn is not a solid ring, rather made up of bits of ice and rocks.
The Moon has much weaker gravity than Earth, so you would weigh about one sixth of your weight on Earth.
Did you know that Earth is known as a Goldilocks planet, as it is not too hot and not too cold? Earth is just right for life.