Infinite Descent
From Destiny 1 Wiki
Infinite Descent is a Sparrow Racing League track located in Maat Mons, Venus. It is a harder track than Campus Martius, the track on Mars.
Lore
Some might see racing through the heart of Vex territory as foolhardy. When Shaxx sent his Redjacks to mark up the SRL track on Venus, however, he ordered them to find a location worthy of the bravest and most skilled Guardians.