The nearest planet to the Earth is _________?

According to new study which published on March 12, 2019 in physics today magazine, the closet planet is mercury.

Mercury is closest to Earth on average because it orbits the Sun more closely. That also means – mind-blowingly – that Mercury is the closest neighbor of all planets in our solar system, including gas giants Jupiter and Saturn and snowball planets Neptune and Uranus on the freezing outer edges of the system.

Naptune is The right answer