Luna's (Earth's moon's) apparent dark spots are giant "dust puddles." They are areas with large collections of dry sediment. Such things are best avoided, since they can be very deep, and therefor deadly.
Galileo called the dark flat parts on the moon "seas" or "maria" in Latin, although they are now known to be basaltic plains formed by ancient volcanic activity.
He thought they were seas. He called them maria (Latin for sea). Today scientists still call the dark, flat parts maria. Marias were formed when magma flowed through the surface of the moon. The magma cooled and became flat and dark.
When Galileo looked through his telescope at the moon, he saw dark, flat parts of the moon's surface which he called maria.
The dark areas that form the 'man in the moon' are large flat plains called maria and the brighter parts of the moon are the lunar highlands and the mountain ranges.
Dark maira of seas
The dark areas that form the 'man in the moon' are large flat plains called maria and the brighter parts of the moon are the lunar highlands and the mountain ranges.
craters
Maria, or "seas", which is what "maria" means.
A "Maria", which is translated into "sea".
Far side
The dark flat areas found on the surface of the moon are called maria, which is the Latin word for "seas." They were formed by ancient volcanic activity and are lower in elevation than the surrounding highlands.
terminator