Hello guys, We're here with some new information from NASA : 
Tethys appears to be stuck to Saturn's A and F rings from this perspective.
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Tethys appears to be stuck to Saturn's A and F rings from this perspective.
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Astronomy news update from NASA : 
What are these strange shapes on Mars? Defrosting sand dunes. As spring dawned on the Northern Hemisphere of Mars, dunes of sand near the pole, as pictured here in late May by ESA's ExoMars Trace Gas Orbiter, began to thaw. The carbon dioxide and water ice actually sublime in the thin atmosphere directly to gas. Thinner regions of ice typically defrost first revealing sand whose darkness soaks in sunlight and accelerates the thaw. The process might even involve sandy jets exploding through the thinning ice. By summer, spots will expand to encompass the entire dunes. The Martian North Pole is ringed by many similar fields of barchan sand dunes, whose strange, smooth arcs are shaped by persistent Martian winds.
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What are these strange shapes on Mars? Defrosting sand dunes. As spring dawned on the Northern Hemisphere of Mars, dunes of sand near the pole, as pictured here in late May by ESA's ExoMars Trace Gas Orbiter, began to thaw. The carbon dioxide and water ice actually sublime in the thin atmosphere directly to gas. Thinner regions of ice typically defrost first revealing sand whose darkness soaks in sunlight and accelerates the thaw. The process might even involve sandy jets exploding through the thinning ice. By summer, spots will expand to encompass the entire dunes. The Martian North Pole is ringed by many similar fields of barchan sand dunes, whose strange, smooth arcs are shaped by persistent Martian winds.
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Our new 'Word Of The Day' article update : mercurial , adj :
(comparable) Having a lively or volatile character; animated, changeable, quick-witted. (not comparable, astrology) Pertaining to the astrological influence of the planet Mercury; having the characteristics of a person under such influence (see adjective sense 1). (not comparable, astronomy) Pertaining to the planet Mercury. (not comparable, chemistry) Of or pertaining to the element mercury or quicksilver; containing mercury. (not comparable, medicine) Caused by the action of mercury or a mercury compound. (not comparable, Roman mythology) Pertaining to Mercury, the Roman god of, among other things, commerce, financial gain, communication, and thieves and trickery; hence (comparable), money-making; crafty. To mark the premiere of English composer Gustav Holst’s orchestral suite The Planets on 29 September 1918, we are featuring a series of words relating to the planets in the Solar System. One of the suite’s movements is Mercury, the Winged Messenger, composed in 1916.
(comparable) Having a lively or volatile character; animated, changeable, quick-witted. (not comparable, astrology) Pertaining to the astrological influence of the planet Mercury; having the characteristics of a person under such influence (see adjective sense 1). (not comparable, astronomy) Pertaining to the planet Mercury. (not comparable, chemistry) Of or pertaining to the element mercury or quicksilver; containing mercury. (not comparable, medicine) Caused by the action of mercury or a mercury compound. (not comparable, Roman mythology) Pertaining to Mercury, the Roman god of, among other things, commerce, financial gain, communication, and thieves and trickery; hence (comparable), money-making; crafty. To mark the premiere of English composer Gustav Holst’s orchestral suite The Planets on 29 September 1918, we are featuring a series of words relating to the planets in the Solar System. One of the suite’s movements is Mercury, the Winged Messenger, composed in 1916.
