What is the smallest planet in the solar system?

It turned out to be Pluto, and later Pluto was disqualified as a planet, so now Mercury is the smallest planet.

Mercury is bigger than the moon 1/3, and it is the closest planet to the sun.

Mercury visual magnitude range is

0.4

~5.5。 Mercury is too close to the sun, so it is often submerged by fierce sunlight. Its orbit is between 45.9 million and 69.7 million kilometers from the sun, so telescopes can rarely observe it carefully. Mercury also has no natural satellites. The only probes close to Mercury are the American Mariner 10 probe and the American Messenger probe. When mariner 10 explored mercury from 1974 to 1975, only about 45% of the surface was photographed. Messenger passed through Mercury in June 5438+October 2008/KLOC-0. Mercury is the fastest moving planet in the solar system. It takes only 88 days to orbit the sun and 58 days to rotate. A day on Mercury is equivalent to 59 days on Earth.