Neptune And Its Moons (Proteus, Larissa, Despina And Galatea) 

Solar System

Crescent Moon and Earth’s Atmosphere Seen by International Space Station

Credit: NASA

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Cassini mosaic of Iapetus, showing the bright trailing hemisphere with part of the dark area appearing on the right (the equatorial ridge is in profile on the right limb). The large crater Engelier is near the bottom; to its lower right can be seen the rim of a partly obliterated, slightly smaller older crater, Gerin.

This false-color mosaic shows the entire hemisphere of Iapetus (1,468 kilometers, or 912 miles across) visible from Cassini on the outbound leg of its encounter with the two-toned moon in Sept. 2007.

Credit: NASA/JPL

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Solar eclipse by Holger Krupp

Dirty thunderstorm

A dirty thunderstorm (also volcanic lightning, thunder volcano) is a weather phenomenon that is related to the production of lightning in a volcanic plume.

A study in the journal Science indicated that electrical charges are generated when rock fragments, ash, and ice particles in a volcanic plume collide and produce static charges, just as ice particles collide in regular thunderstorms.

Volcanic eruptions are sometimes accompanied by flashes of lightning. However, this lightning doesn’t descend from storm clouds in the sky. It is generated within the ash cloud spewing from the volcano, in a process called charge separation.

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In early 2001 during a launch of Atlantis, the Sun, Earth, Moon, and rocket were all properly aligned for this photogenic coincidence.

Image Credit: Pat McCracken, NASA