domingo, 5 de fevereiro de 2017

Astronomy picture of the day - 2017 February 5 - Odysseus Crater on Tethys

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Odysseus Crater on Tethys 
Image Credit: Cassini Imaging TeamSSIJPLESANASA
Explanation: Some moons wouldn't survive the collision. Tethys, one of Saturn's larger moons at about 1000 kilometers in diameter, survived the collision, but today exhibits the resulting expansive impact crater Odysseus. Sometimes called the Great BasinOdysseus occurs on the leading hemisphere of Tethys and shows its great age by the relative amount of smaller craters that occur inside its towering walls. The density of Tethys is similar to water-ice. Thefeatured image was captured in November by the robotic Cassini spacecraft in orbit around Saturn as it swooped past the giant ice ball. Cassini has now started on its Grand Finale Tour which will take it inside Saturn's rings andculminate in September with a dive into Saturn's thick atmosphere.