The dark and relatively featureless lunar plains which we can seen with the naked eye are called maria (Latin for "seas"), as they were once believed by ancient astronomers to be filled with water....
The Sea of Tranquility. It obviously is not a see but rather a large flat plain on the moon. Early astronomers, with their rudimentary telescopes, mistakenly thought it to be a sea.
the dark patches on the moons surface r called seas, but theyre not really seas at all. they were formed 3 billion years ago when lava from inside the moon and flowed into the the craters and then...