{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

European observations - William Herschel discovered two...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
European observations (17th–19th centuries) Robert Hooke noted the shadows (a and b) cast by both the globe and the rings on each other in this drawing of Saturn in 1666. Saturn's rings require at least a 15-mm-diameter telescope [105] to resolve and thus were not known to exist until Galileo first saw them in 1610. [106] [107] He thought of them as two moons on Saturn's sides. [108] [109] It was not until Christian Huygens used greater telescopic magnification that this notion was refuted. Huygens discovered Saturn's moon Titan; Giovanni Domenico Cassini later discovered four other moons: Iapetus , Rhea , Tethys and Dione . In 1675, Cassini discovered the gap now known as the Cassini Division. [110] No further discoveries of significance were made until 1789 when
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: William Herschel discovered two further moons, Mimas and Enceladus . The irregularly shaped satellite Hyperion , which has a resonance with Titan, was discovered in 1848 by a British team. [111] In 1899 William Henry Pickering discovered Phoebe , a highly irregular satellite that does not rotate synchronously with Saturn as the larger moons do. [111] Phoebe was the first such satellite found and it takes more than a year to orbit Saturn in a retrograde orbit . During the early 20th century, research on Titan led to the confirmation in 1944 that it had a thick atmosphere—a feature unique among the solar system's moons....
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern