25.7 MB (545.7 KB compressed)
3000 x 3000 pixels
25.4 x 25.4 cm ⏐ 10.0 x 10.0 in (300dpi)
ECKHARD SLAWIK / SCIENCE PHOTO LIBRARY ECKHARD SLAWIK / SCIENCE PHOTO LIBRARY
Waxing gibbous Moon. Image 8 of 27. Optical image of a waxing (increasing in apparent size) gibbous Moon 8 days into its 28-day cycle. The lunar phases arise as the Moon's orbit of the Earth shows the Earth-facing side moving into and out of the light of the Sun. This Earth-facing side of the Moon is locked in place by the gravitational influence of the Earth. This results in a lunar day that equals the length of the lunar Earth orbit. On a waxing Moon the day-night line (terminator) marks the lunar dawn. The Moon is gibbous when it is more than half full. Taken in September 2001. A sequence of the monthly cycle of Moon phases is shown on images R340/644-670.
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