Atmosphere of the Moon
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The atmosphere of the Moon is a very sparse layer of gases surrounding the Moon, consisting only of an exosphere. For most practical purposes, the Moon is considered to be surrounded by vacuum. The el
Surveyor 7 observes levitating dust, a phenomenon named Lunar horizon glow
The thin lunar atmosphere is visible on the Moon's surface at sunrise and sunset with the lunar horizon glow and lunar twilight rays, like Earth's crepuscular rays. This Apollo 17 sketch depicts the glow and rays among the general zodiacal light.
Full Moon 2010
Chaotic Clouds of Jupiter
Atmosphere of Mercury
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Mercury, the closest planet to the Sun, has the weakest magnetic field and the smallest mass of the four terrestrial planets. It has an extremely tenuous and variable exosphere containing hydrogen, he
Atmosphere of the Moon
…Hydrogen: fewer than 17 This yields approximately 80,000 total atoms per cubic centimeter, marginally higher than the quantity posited to exist in the atmosphere of Mercury. While this greatly exceeds the density of the solar wind, which is usually on the order of just a few protons per cubic centimeter, it is virtually a…
Mercury's surface, with the atmosphere too thin to be visible.
Mercury's calcium and magnesium tail during MESSENGER's third flyby on September 29, 2009
Mercury's sodium tail during MESSENGER's first flyby on January 14, 2008
Mercury in true color