Free Republic 1st Quarter Fundraising Target: $88,000 Receipts & Pledges to-date: $80,016
90%  
Woo hoo!! Working on the last $8k!! Let's git 'er done!! Thank you all very much!!

Keyword: tethys

Brevity: Headers | « Text »
  • Astronomy Picture of the Day -- Saturn's Rings from the Dark Side

    12/31/2012 6:36:46 AM PST · by SunkenCiv · 17 replies
    NASA ^ | December 31, 2012 | (see photo credit)
    Explanation: What do Saturn's rings look like from the dark side? From Earth, we usually see Saturn's rings from the same side of the ring plane that the Sun illuminates them -- one might call this the bright side. Geometrically, in the above picture taken in August by the robot Cassini spacecraft now orbiting Saturn, the Sun is behind the camera but on the other side of the ring plane. Such a vantage point gives a breathtaking views of the most splendid ring system in the Solar System. Strangely, the rings have similarities to a photographic negative of a front...
  • Astronomy Picture of the Day -- Saturn: Bright Tethys and Ancient Rings

    09/16/2012 8:37:42 AM PDT · by SunkenCiv · 14 replies
    NASA ^ | September 16, 2012 | (see photo credit)
    Explanation: How old are Saturn's rings? No one is quite sure. One possibility is that the rings formed relatively recently in our Solar System's history, perhaps only about 100 million years ago when a moon-sized object broke up near Saturn. Evidence for a young ring age includes a basic stability analysis for rings, and the fact that the rings are so bright and relatively unaffected by numerous small dark meteor impacts. More recent evidence, however, raises the possibility that some of Saturn's rings may be billions of years old and so almost as old as Saturn itself. Inspection of images...
  • Astronomy Picture of the Day 1-10-03

    01/10/2003 3:57:30 AM PST · by petuniasevan · 4 replies · 311+ views
    NASA ^ | 1-10-03 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2003 January 10 The Crab that Played with the Planet Credit & Copyright: Ron Wodaski, Newastro Remote Telescope at New Mexico Skies Explanation: Wandering through the constellation Taurus, Saturn made its closest approach to planet Earth last month, tilting its lovely rings toward appreciative skygazers while rising high in midnight skies. On January 4th and 5th, Saturn also crossed in front of the high and far-off Crab Nebula...
  • Astronomy Picture of the Day 5-19-02

    05/19/2002 12:40:24 AM PDT · by petuniasevan · 9 replies · 278+ views
    NASA ^ | 5-19-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 May 19 Saturn's Moon Tethys Credit: Voyager Project, NASA; Copyright: (digital w/colortable): Calvin J. Hamilton Explanation: Tethys is one of the larger and closer moons of Saturn. It was visited by both Voyager spacecraft - Voyager 1 in November 1980 and by Voyager 2 in August 1981. Tethys is now known to be composed almost completely of water ice. Tethys shows a large impact crater that nearly...