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Jean-Dominique Cassini aka Giovanni Domenico Cassini (1625-1712). An Italian astronomer who became director of the Paris Observatory and a naturalized Frenchman. For his early observations of Saturn's rings and moons NASA named its Cassini mission to Saturn in his honor. Cassini is still taking fabulous pictures of the Saturnian system. (Portrait: Leopold Durangel) ©Mona Evans, "10 Amazing Facts about Saturn's Moons" http://www.bellaonline.com/articles/art28136.asp

Caroline Lucretia Herschel (16 de marzo de 1750 – 9 de enero de 1848) Fue una astrónoma inglesa de origen alemán.. Trabajó con su hermano Sir William Herschel ayudándole tanto en la elaboración de sus telescopios como en sus observaciones. Descubrió ocho cometas entre los que destaca el correo (periódico) Herschel-Rigollet, que lleva su nombre pues lo descubrió el 21 de diciembre de 1788.

NASA's Cassini spacecraft has been studying Saturn and its moons since it entered orbit in 2004. This image, taken on Oct. 5, 2008, is a stunning mosaic of the geologically active Enceladus after a Cassini flyby.

Cassini view of Saturn's rings (2012). The F ring is the outer one, the inner one is the broad A ring. In the Encke gap of the A ring, you can see the shepherd moon Pan. (Image credit: NASA / JPL / Space Science Institute) ©Mona Evans, "10 Amazing Facts about Saturn's Moons" http://www.bellaonline.com/articles/art28136.asp

▶ Rhea Transits Saturn - YouTube (Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA) The slim crescent of the moon Rhea transits a crescent Saturn. In an interplay of contrast and shadow, the moon goes dark against the planet, and then its crescent suddenly brightens as it slips in front of Saturn's night side. The view is edge-on to the rings, which you can see as a dark line. Mona Evans, “Rhea Moon of Saturn” http://www.bellaonline.com/articles/art56119.asp

Saturn's moon Iapetus. Comparison of the two hemispheres. The dark terrain is called Cassini Regio after Jean Dominique Cassini. It's fairly smooth, showing that new material is being deposited which covers old cratering. (Credit: JPL NASA) Mona Evans, "10 Amazing Facts about Saturn's Moons" http://www.bellaonline.com/articles/art28136.asp

Titan, Saturn's largest moon. You can see two of Saturn's rings and one of its tiny moons Epimetheus. (Credit: NASA/JPL/Space Science Institute) ©Mona Evans, "10 Amazing Facts about Saturn's Moons" http://www.bellaonline.com/articles/art28136.asp