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Titan up close
Scientists reveal stunning pictures of Saturn's moon Titan and other results during this news conference from July 3. (38min 17sec file)
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Saturn ring pictures
Cassini's stunning close-up images of the rings around Saturn, taken just after the craft entered orbit Thursday morning, are presented with expert narration by Carolyn Porco, the mission imaging team leader. (8min 39sec file)
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Burn ignition!
Mission control erupts in applause as communications from Cassini confirm the orbit insertion burn has begun. (60sec file)
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Burn completed
Signals from Cassini announce the conclusion of the Saturn orbit insertion burn, confirming the spacecraft has arrived at the ringed planet. (2min 15sec file)
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Post-arrival briefing
Mission officials hold a post-orbit insertion burn news conference at 1 a.m. EDT July 1 to discuss Cassini's successful arrival at Saturn. (25min 27sec file)
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Wednesday's status briefing
Cassini's health in the final hours before arrival at Saturn is presented in this status briefing from 12 p.m. EDT on June 30. (33min 09sec file)
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International cooperation
Officials from the U.S., European and Italian space agencies discuss the international cooperation in the Cassini mission and future exploration projects during this news conference from 2 p.m. EDT June 30. (19min 35sec file)
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'Ring-side' chat
This informal "ring-side chat" from 5 p.m. EDT June 30 discusses the Cassini mission to Saturn and the future of space exploration. (49min 20sec file)
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Phoebe science briefing
Scientists report scientific results from the Cassini spacecraft's close-up examination of Saturn's moon Phoebe. (31min 53sec file)
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Cassini preview
The Cassini spacecraft's arrival at Saturn is previewed in this detailed news conference from NASA Headquarters on June 3. (50min 01sec file)
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Cassini mission science
The scientific objectives of the Cassini mission to study the planet Saturn, its rings and moons are explained by Charles Elachi, director of the Jet Propulsion Laboratory. (4min 54sec file)
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Ultraviolet pictures hint at origin of Saturn's rings
UNIVERSITY OF COLORADO NEWS RELEASE
Posted: July 7, 2004

The best view ever of Saturn's rings in the ultraviolet indicates there is more ice toward the outer part of the rings, hinting at ring origin and evolution, say two University of Colorado at Boulder researchers involved in the Cassini mission.


From the inside out, the "Cassini division" in faint red at left is followed by the A ring in its entirety. The A ring begins with a "dirty" interior of red followed by a general pattern of more turquoise as it spreads away from the planet, which indicates denser material made up of ice. The red band roughly three-fourths of the way outward in the A ring is known as the Encke gap.
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Researchers from CU-Boulder's Laboratory for Atmospheric and Space Physics, Joshua Colwell and Larry Esposito, said the UV spectra taken during the Cassini spacecraft's orbital insertion June 30 show definite compositional variation in the A, B and C rings.

Esposito, who discovered the F ring around Saturn in 1979 using Pioneer 11 data, is the team leader for Cassini's Ultraviolet Imaging Spectrograph, or UVIS, a $12.5 million instrument riding on the spacecraft. A UVIS team member and ring expert, Colwell created the color-enhanced images from the spectra.

The CU-Boulder built UVIS instrument is capable of resolving the rings to show features up to 60 miles across, roughly 10 times the resolution obtained by the Voyager 2 spacecraft. The instrument was able to resolve the "Cassini division," discovered by Giovanni Domenico Cassini in the 17th century, which separates the A and B rings of Saturn, proving the rings are not one contiguous feature.

The ring system begins from the inside out with the D, C, B and A rings followed by the F, G and E rings. The red in both images indicates sparser ringlets likely made of "dirty," and possibly smaller, particles than in the denser, icier turquoise ringlets.


This image shows the outer C and inner B rings respectively from left to right, with the inner B ring beginning a little more than halfway across the image. The general pattern is from "dirty" red particles to the denser ice shown in turquoise as the ringlets spread outward.
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Spaceflight Now Plus
Additional coverage for subscribers:
VIDEO: WATCH SATURDAY'S NEWS CONFERENCE ON TITAN PICTURES QT
VIDEO: WATCH FRIDAY'S SCIENCE NEWS CONFERENCE QT

VIDEO: THURSDAY'S NEWS BRIEFING ON CASSINI'S FIRST PICTURES QT
VIDEO: RING PICTURES ARE PRESENTED WITH EXPERT NARRATION QT
VIDEO: CASSINI RE-DISCOVERS TINY MOONS ATLAS AND PAN QT
VIDEO: CASSINI BOOMING SOUNDS FROM BOW-SHOCK CROSSING QT

VIDEO: CASSINI BEGINS ENGINE FIRING TO ENTER ORBIT QT
VIDEO: BURN ENDS SUCCESSFULLY TO PUT CASSINI IN ORBIT QT
VIDEO: POST-ARRIVAL NEWS CONFERENCE QT

VIDEO: WEDNESDAY'S 12 P.M. EDT CASSINI STATUS BRIEFING QT
VIDEO: A LOOK AT INTERNATIONAL COOPERATION QT
VIDEO: 'RING-SIDE CHAT' ABOUT SPACE EXPLORATION QT
VIDEO: AN OVERVIEW OF CASSINI'S RADIO SCIENCE QT

VIDEO: TUESDAY'S CASSINI MISSION OVERVIEW BRIEFING QT
VIDEO: CASSINI'S ARRIVAL AT SATURN EXPLAINED QT
VIDEO: SCIENCE OBJECTIVES FOR CASSINI ORBITER QT
VIDEO: HUYGENS LANDER SCIENCE OBJECTIVES QT
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Apollo 11 Mission Report
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Rocket DVD
If you've ever watched a launch from Kennedy Space Center, Cape Canaveral, Vandenberg Air Force Base or even Kodiak Island Alaska, there's no better way to describe what you witnessed than with this DVD.
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Ares 1-X Patch
The official embroidered patch for the Ares 1-X rocket test flight, is available for purchase.
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Apollo Collage
This beautiful one piece set features the Apollo program emblem surrounded by the individual mission logos.
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Expedition 21
The official embroidered patch for the International Space Station Expedition 21 crew is now available from our stores.
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Hubble Patch
The official embroidered patch for mission STS-125, the space shuttle's last planned service call to the Hubble Space Telescope, is available for purchase.
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