fun fact about MarsMars has the tallest mountain in the Solar SystemThe tallest mountain in the Solar System is the mighty Olympus Mons on Mars. It rises up 16 miles above the surrounding plains.
And Mars has the longest, deepest canyon in the Solar SystemOne of the most distinct features on the surface of Mars is the Valles Marineris canyon. It stretches 4,000 km (2,485 mile) along the equator of Mars, and can be as deep as 4miles (7km) in places. If you could move the Valles Marineris to Earth, it would stretch right across the United States.