Second Night

The Moon, Earth's only natural satellite, is a prominent fixture in the night sky. It is approximately 384,400 kilometers (238,855 miles) from Earth and has a diameter of about 3,474 kilometers (2,159 miles). The Moon's surface is a mix of highlands and maria. Highlands are heavily cratered and older, while maria are smoother, darker plains formed by ancient volcanic activity.

The Moon's surface is marked by numerous impact craters, with notable ones including Tycho, Copernicus, and Clavius. Tycho, located in the southern lunar highlands, is easily recognizable by its prominent ray system — streaks of ejected material. The maria, such as Mare Imbrium and Mare Serenitatis, are vast basaltic plains that appear darker than the surrounding highlands.

The terminator, the line dividing the illuminated and dark halves of the Moon, shifts as the Moon orbits Earth. This movement reveals different features in relief, enhancing the visibility of craters and mountains. The Moon has a synchronous rotation, meaning it always shows the same face to Earth. Its surface temperature varies widely, from about 127°C (260°F) in sunlight to -173°C (-280°F) in shadow.