Astronomical photography by U.S. observatories is used to show the phases of the moon, the Polar regions, the craters, and other features of the moon's surface.
(Astronomical photography by U.S. observatories; is used; to show the phases of the moon, the Polar regions, the craters, and other features of the moon's surface)
Astronomical photography by U.S. observatories
is used
to show the phases of the moon, the Polar regions, the craters, and other features of the moon's surface