This week, SC Messier reports on volcanic activity on the Moon! Before we all jump out of our chairs, it must be clarified that the basaltic lavas that decked our Moon's surface, known as maria (singular: mare), are nothing like Earth's molten lava that we're familiar with. In fact, since the Moon has no water, maria are very dry, so there aren't any volcanic explosions. As a result, lava on the Moon flowed smoothly and quietly with no action. Lunar maria didn't come from big volcanoes, but from the Moon's surface. However, lava hasn't roamed our Moon in millions of years, but today, SC Messier investigates the dark, peculiar spots of our Moon. How did they get there? Along with marks from astroid impacts, those spots, as pictured, are actually scars left from when the Moon was coated in lava! Don't be alarmed, though, for volcanic activity on the Moon isn't unusual.