Find out information about the planet Mercury, the smallest planet in the Solar System. From its geological surface and structure, its exosphere (atmospheric and geological conditions), its planetary rotation and orbit, to theories on Mercury’s formation. The right answer for this question is that the smallest planet in our Solar System is Mercury. Introduction to Mercury: The Smallest Planet Mercury is one of the eight planets that orbit the Sun in our Solar System. It is the smallest and the closest planet to the Sun. This makes Mercury the first planet in the solar system, neighbour to planet ... What are the smallest planets that exist? Mercury is the smallest planet in the Solar System. It has a diameter of 4,879 kilometers, three times smaller than Earth's. It is so small that even Ganymede, a satellite of Jupiter and the largest in the Solar System, at 5,268 km in diameter, is larger than Mercury. Let this serve as context. We have compiled the list in descending order of size and next to each name we will indicate the diameter of the planet in question. And now, without further ... 5. Our home planet Earth is the fifth largest of the eight planets and measures in at 12,756 km in diameter. This means that Earth is actually approximately 2.6 times the diameter of the smallest planet, Mercury. Another size comparison puts Earth at 3.67 times the diameter of the Moon. 6.
