Planet closest to the Sun
Mercury
Planets in order
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto
My very easy method just speeds up naming planets
What is the sea of tranquility
A dark spot located in the northern hemisphere of the Moon. The sea is not a body of water but a lower-altitude plain. As a result of earlier periods of lunar volcanism, it is filled with dark, solidified lava.