Scale Comparison
Mercury is about 2.1 times Pluto’s diameter. It is the smallest major planet, while Pluto is a dwarf planet.
The classification boundary is dynamical rather than a diameter cutoff: Mercury dominates its orbital zone, whereas Pluto shares its region with many Kuiper Belt objects.
Objects
Pluto is an icy dwarf planet with a surprisingly active surface and atmosphere. New Horizons found nitrogen-ice glaciers flowing across its plains and blue hazes in its sky.
Mercury is the smallest planet in the Solar System and the closest one to the Sun. Because of its unusual spin-orbit rhythm, one Mercury solar day lasts 176 Earth days, which is longer than its 88-day year.
Continue with another comparison or open the full scale.
About
Scale of Space is a scroll-based journey through the universe, placing objects on a single logarithmic scale so you can compare size across an unbroken range.
Guides explain selected parts of that range, while focused views filter the objects by subject.