Space Shuttle Enterprise Crew nasa honors nimoy boing boing Enterprise Space Crew Shuttle

Space Shuttle Enterprise Crew nasa honors nimoy boing boing Enterprise Space Crew Shuttle

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Space Shuttle Enterprise Crew

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The existence of such powerful roaring winds kicking up violent and powerful dust storms suggests that the underlying sand can be set in motion, too, and that the giant dunes covering Titan's equatorial regions are still active and continually changing.



Vast regions of dark dunes also extend across Titan's exotic landscape, especially around its equatorial regions. Unlike Earth's sand, the "sand" that creates Titan's dunes is composed of dark grains of hydrocarbon that resemble coffee grounds. The tall linear dunes of this misty moisty moon-world appear to be quite similar to those seen in the desert of Namibia in Africa. Because Titan's surface is pockmarked by relatively few impact craters, its surface is considered to be quite young. Older surfaces display heavier cratering than more youthful surfaces, whose craters have been "erased" by resurfacing. This resurfacing is caused by processes that cover the scars left by old impacts as time goes by. Our own planet is similar to Titan in this respect. The craters of Earth are erased by the ongoing processes of flowing liquid (water on Earth), powerful winds, and the recycling of Earth's crust as a result of plate-tectonics. These processes also occur on Titan, but in modified forms. In particular, the shifting of the ground resulting from pressures coming from beneath (plate tectonics), also appear to be at work on this veiled moon-world. However, planetary scientists have not seen signs of plates on Titan that are analogous to those of our own planet.



Ganymede is the largest moon in our Solar System. Indeed, its impressive diameter of nearly 3,280 miles makes it almost as big as Mars! Astronomers have known since the 1990s that this frigidly cold moon, that circles around the gas-giant planet Jupiter, contains a hidden salty subsurface ocean of liquid water, sloshing around deep beneath its secretive shell of ice. However, in May 2014, planetary scientists announced that the situation may be somewhat more complicated--Ganymede's ocean might be organized like a multi-tiered sandwich, with ice and oceans stacked up in several layers, according to new NASA-funded research that models this enormous moon's composition.