The Moon
The Moon is Earth’s only natural satellite—a rocky, cratered body about one‑quarter the diameter of Earth, orbiting at an average distance of approximately 384,400 km. It influences tides, stabilizes Earth’s axial tilt, and was formed about 4.5 billion years ago following a collision between Earth and a Mars-sized object.
Source: science.nasa.gov
APODs including "The Moon"
Restored: First Image of the Earth from the Moon
18/11/2008
Pictured above is the first image ever taken of the Earth from the Moon. The image was taken in 1966 by Lunar Orbiter 1 and heralded by then-journalists as the Image of the Century. It was taken about two years before the Apollo 8 crew snapped its more famous color cousin. Recently, modern technology has allowed the recovery of higher resolution images from old data sources such as Lunar Orbiter tapes than ever before. Specifically, recovery of the above image was initiated 20 years ago by Nancy Evans, and completed recently by Dennis Wingo and Keith Cowing who lead the Lunar Orbiter Image Recovery Project. Lunar Orbiter Image Recovery Project. Images like that above carry more than aesthetic value -- comparison to recent high definition images of the Moon enables investigations into how the Moon has been changing.