Which planet is closest to the sun?
Venus
Mars
Earth
Mercury
Mercury is the closest planet to the sun and the smallest planet in the solar system. On average, it is a little more than one-third the distance from the sun than Earth. Or, put another way, Earth is almost three times farther from the sun than Mercury. Mercury orbits the sun once every 88 Earth days, so one year on Mercury is 88 Earth days. However, a day on Mercury is longer than an Earth day. One Mercury day lasts for 59 Earth days. Even though Mercury is the closest planet to the sun, Venus is the hottest planet in our solar system.
The correct answer is Mercury.