NASAのインスタグラム(nasa) - 6月6日 05時58分

Giant Landform on Mars: Sandy landforms formed by the wind, or aeolian bedforms, are classified by the wavelength--or length--between crests. On Mars, we can observe four classes of bedforms (in order of increasing wavelengths): ripples, transverse aeolian ridges (known as TARs), dunes, and what are called “draa.” All of these are visible in this Juventae Chasma image.

Here, this giant draa possesses steep faces or slip faces several hundreds of meters tall and has lower-order superposed bedforms, such as ripples and dunes. A bedform this size likely formed over thousands of Mars years, probably longer.

Image Credit: NASA/JPL/University of Arizona

#hirise #nasa #mars #marscuriosity #msl #planets #science

[BIHAKUEN]UVシールド(UVShield) 更年期に悩んだら

>> 飲む日焼け止め！「UVシールド」を購入する