The correct sequence of the given planets in increasing order of their size (diameter) is as follows: Mercury – Mars – Venus – Earth – Uranus. Planet Sizes (Largest to Smallest): → Jupiter (diameter = 1,42,800 km) → Saturn (diameter = 1,20,660 km) → Uranus (diameter = 51,118 km) → Neptune (diameter = 49,528 km) → Earth (diameter = 12,756 km) → Venus (diameter = 12,104 km) → Mars (diameter = 6,787 km) → Mercury (diameter = 4,879.4 km)