What Are Trans-Neptunian Object?

ENCELADUS: TIGER STRIPES AND THE CHANCE FOR LIFE Discovered by William Hershel in 1789, Enceladus is the sixth largest moon of Saturn. It appears as a small, faint speck through a telescope and until recently not much was known about this mysterious world.

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‘Displaying the Various Phenomena of the Atmosphere’ - Diagram of Meteorology, 1846 - drawn and engraved by John Emslie. Written by James Reynolds of 174 Strand in London, 1850-1860.

Space Age landscapes by planetary scientist William K. Hartmann.

Astronaut tweets

Lightning and Rainbow in Arizona 

“One of the most actively changing areas on Mars are the steep edges of the North Polar layered deposits. This image from NASA’s Mars Reconnaissance Orbiter (MRO) shows many new ice blocks compared to an earlier image in December 2006. An animation shows one example, where a section of ice cliff collapsed. The older image (acquired in bin-2 mode) is not as sharp as the newer one.” Credit - nasa.gov

ancient greek word of the day: κλονοκάρδιος (klonokardios), heart-stirring, epith. of the thunderbolt

Retrograde motion of Mars in the night sky of the Earth.

Image Credit: Tunc Tezel