Before revision: This is because a higher mass/drag area means the spacecraft does not have sufficient drag to slow down early in it's decent, relying on the thicker atmosphere found at lower altitudes for the majority of it's speed reduction .
After revision: This is because a higher mass/drag area means the spacecraft does not have sufficient drag to slow down early in it's decent, relying on the thicker atmosphere found at lower altitudes for the majority of it's deceleration .