The moon is the only world beyond the Earth whose landscape is laid out for view with the naked eye. If your eyesight is normal (or well-corrected by glasses), you can make out a great many features on the moon's face-plains,mountainous regions, and the marks of meteorite impacts. The most obvious markings are dark gray patches. These are flat plains of lava, but 17th century astronomers using the newly invented telescope assumed they were water.They named each spot as if it were a sea, mare in Latin (pronounced mah-ray)