The Rings of Saturn…final remarks. The size and structure of Saturn’s ring The ring extends out to about 2.4 Saturnian radii, And is composed of 3 main.

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Presentation transcript:

The Rings of Saturn…final remarks

The size and structure of Saturn’s ring The ring extends out to about 2.4 Saturnian radii, And is composed of 3 main rings and a prominent gapap

The Cassini spacecraft has revealed incredible and beautiful detail in the rings

The existence of Saturn’s ring due to “tidal disruption” Tidal “stresses” due to a difference of the gravitational force on the front and rear side of a moon near a planet. If a moon gets closer to a planet than about 2.4 planetary radii, the tidal stresses pull the moon apart In case of Saturn, a moon probably moved within the “tidal disruption radius” and was torn to rubble.

Saturn’s ring is a nearby example (and the first discovered) of a very broad class of astronomical phenomenon called an accretion disk Accretion disks surround large black holes, and in a sense the disk of the Milky Way galaxy is one

Way Out … exploration of the outer solar system

Further out from the Sun…new planets

The basic facts on the planets Uranus and Neptune Semimajor axes: au (U) and (N) Orbital periods: years (U) and years (N) Diameters: 4.0XEarth (U) and 3.9XEarth (N) Masses: 14.5XEarth (U) and 17.1XEarth (N)

Uranus as seen from Voyager 2 The “blue marble”

Neptune as seen by Voyager 2

The basic facts on Uranus and Neptune

Atmospheric structure of Uranus and Neptune: it’s cold out there

Uranus and Neptune appear to be in yet a new class of planets. Much different than the terrestrial planets, but not like Jupiter and Saturn either. There is much variety in the major planets

In 1989, Voyager 2 left Neptune and went deeper into space. It is still in communication with us

The limits of the solar system

The Odyssey of the Voyager spacecraft

Locations of the Voyager Voyager 1: au from Sun (March 2008) = 9.82 billion miles = 14 light hours Voyager 2: 85.5 au

The Heliospheric boundary: between the solar wind and the interstellar medium

The University of Iowa radio instruments on Voyager 1 and 2 “picked up” the termination shock years before we got there

Radio emission from deep space Voyager spacecraft radio receiver

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