There are 8 planets and 288 known moons in our Solar system.
Jupiter is the largest planet.
Mercury is the smallest planet.
Saturn is the planet with the highest number of known moons, 146.
The Asteroid belt between Mars and Jupiter contains between 1.1 to 1.9 million asteroids larger than 1 kilometer diameter.
Olympus Mons on Mars is the highest mountain in the Solar System. It has an elevation of 21.9 kilometers (13.6 miles).
Venus is the Hottest planet.
Uranus is the coldest planet.
Ganymede (the largest moon of Jupiter) and Titan (the largest moon of Saturn) are larger the Mercury in diameter.
There are 4 terrestrial planets - Mercury, Venus, Earth, and Mars, and 4 gas giants - Jupiter, Saturn, Uranus, and Neptune. Uranus and Neptune are also known as ice giants.
The Solar System began forming about 4.6 billion years ago.