![]() We now know these spots to be plains of basalt created by early volcanic eruptions, but the nomenclature of ‘maria’ (plural) or ‘mare’ (singular) remains. Similar maps from Johannes Hevelius (1647), Giovanni Riccioli and Francesco Grimaldi (1651) were published over the next few years. Water & Ices Water Discovery Timeline Explore this history in an interactive timeline What’s big, covered in water, yet 100 times drier than the Sahara Desert It’s not a riddle, it’s the Moon For centuries, astronomers debated whether water exists on Earth’s closest neighbor. In 1645, Dutch astronomer Michael van Langren published the first-known map of the Moon referring to the dark spots as “maria” – the Latin word for “seas” – and putting into writing the widely-held view that the marks were oceans on the lunar surface. When early astronomers looked up at the Moon, they were struck by the large, dark spots on its surface. Here is a brief history of the discoveries leading up to the confirmation of water on the Moon. Why does the Moon turn red during a lunar eclipse The same phenomenon that makes our sky blue and our sunsets red causes the Moon to turn red during a lunar eclipse. Here are some more skywatching tips for the month of May. ![]() 20, 1966, perched atop an Atlas D first stage and carrying at its tip a spacecraft called Surveyor 2. What can I expect to observe What else can I see tonight The Moon will be in the constellation Libra. In 2020, data from NASA’s SOFIA mission confirmed water exists in the sunlit area of the lunar surface as molecules of H 2O embedded within, or perhaps sticking to the surface of, grains of lunar dust. This particular hunk of metal left Earth on Sept. What’s big, covered in water, yet 100 times drier than the Sahara Desert? It’s not a riddle, it’s the Moon! For centuries, astronomers debated whether water exists on Earth’s closest neighbor. Explore this history in an interactive timeline › ![]()
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