FRANK ZULLO / SCIENCE PHOTO LIBRARY FRANK ZULLO / SCIENCE PHOTO LIBRARY
Moon and planets. Crescent Moon (at right) with the planets Venus (bright, at upper left), Mars (at upper left) and Jupiter (at lower centre) in the dusk sky. These heavenly bodies do not produce their own light but reflect that of the Sun. The Moon appears as a crescent as only part of its lit face is facing the Earth. Although Venus appears as a pinpoint of light to the naked eye, it shows phases like the Moon when viewed through a telescope. Jupiter and Mars, being further from the Sun than Earth, do not appear in phases to Earth observers. Photographed from Arizona, USA.
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