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First Person -- Dr. Kevin Grazier

Kevin Grazier
Published: March 28, 2005

Get an inside view of NASA's Cassini mission to Saturn with JPL's Dr. Kevin Grazier, who also discusses his career covering science fact and fiction.

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This image taken by NASA's Dawn spacecraft presents two small craters on Ceres, located in the vicinity of Toharu Crater. Juling appears at the top and Kupalo at bottom. Both craters are relatively...
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Juling and Kupalo Craters
Juling and Kupalo Craters
High Above Saturn's Cloud Tops July 2, 2004 Full-Res: PIA06346 These graphs illustrate wind strength (bottom) and temperature abo...
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High Above Saturn's Cloud Tops
High Above Saturn's Cloud Tops
This view from NASA's Cassini spacecraft looks toward Saturn's icy moon Dione, with giant Saturn and its rings in the background, just prior to the mission's final close approach to the moon on Aug...
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This view from NASA's Cassini spacecraft looks toward Saturn's icy moon Dione, with giant Saturn and its rings in the background, just prior to the mission's final close approach to the moon on August 17, 2015.
Imminent Approach to Dione
In this stunning image, the Cassini spacecraft looks at the dark side of Saturn's largest moon. The narrowing circle of light surrounding Titan is produced by sunlight scattering through Titan's ...
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Titan
Incomplete Halo
This raw, unprocessed image of Saturn's moon Rhea was taken on Jan. 11, 2011, during the “R-3” flyby. The flyby returned Cassini's best imaging of Rhea to date. At closest approach, Cassini flew ju...
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Rhea
Craggy Craters on Rhea
The young rays of Mena crater contrast brightly against the surrounding surface, though the rays will gradually fade with time. 
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Mena crater on the planet Mercury
The Bright Rays of Mena
Dione appears cut in two by Saturn's razor-thin rings, seen nearly edge-on in a view from NASA's Cassini spacecraft.
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Black and white image of moon Dione divided by Saturn
Dione Divided
The Cassini spacecraft gazes toward a distant star as Saturn's rings slip past in the foreground. At upper left is the outer A ring, with its dark Keeler Gap. At lower right, a train of bright clum...
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A star between Saturns rings
A Helpful Star
Rhea's surface gains some depth in this stereo image, or anaglyph, which features the bright and geologically young-looking rayed crater on the moon's leading hemisphere. The view was created from ...
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Rhea's surface in a stereo image
Rhea's Pop-up Crater
This montage of images, made from data obtained by Cassini's visual and infrared mapping spectrometer, shows the location on Saturn where the NASA spacecraft entered Saturn's atmosphere on Sept. 15...
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Color enhanced image of Saturn clouds
Impact Site: Infrared Image
It's difficult not to think of an egg when looking at Saturn's moon Methone, seen here during a Cassini flyby of the small moon. The relatively smooth surface adds to the effect created by the oblo...
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Methone
Gray Egg
NASA's Cassini spacecraft spied details on the pockmarked surface of Saturn's moon Prometheus (86 kilometers, or 53 miles across) during a moderately close flyby on Dec. 6, 2015.
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NASA's Cassini spacecraft spied details on the pockmarked surface of Saturn's moon Prometheus (86 kilometers, or 53 miles across) during a moderately close flyby on Dec. 6, 2015.
Prometheus Up Close
Cassini's climb to progressively higher elevations reveals the "negative" side of Saturn's rings. As the Sun shines through the rings, they take on the appearance of a photonegative: the dense B ri...
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Saturn's rings
What's That Speck?
A transitional region in Saturn's atmosphere features long, linear cloud shapes, flanked to the north and south by more turbulent swirls. At top center in this view swirls a dark vortex ringed by b...
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Saturn's atmosphere
Cloud Detail
Slipping into shadow, the south polar vortex at Saturn's moon Titan still stands out against the orange and blue haze layers that are characteristic of Titan's atmosphere.
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Slipping into shadow, the south polar vortex at Saturn's moon Titan still stands out against the orange and blue haze layers that are characteristic of Titan's atmosphere.
Dusk in the South
This view of Saturn looks toward the planet's night side, lit by sunlight reflected from the rings. The mosaic shows the location where Cassini entered Saturn's atmosphere.
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Saturn's night side
Final Frontier
The ring moon Prometheus continues its work shaping the delicate F ring as Dione looks on. It is easy to see how Prometheus has an irregular, oblong shape, while Dione is quite round. The rings ar...
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Prometheus, the F ring, and Dione
Prometheus With Distant Dione
This image of Jupiter's moon Ganymede was taken by NASA's Juno spacecraft during its June 7, 2021, flyby of the icy moon. 
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Image of Ganymede taken from Juno spacecraft
Juno's Ganymede Close-up
Cassini acquired this view of Titan on April 13, 2007, following a flyby of the Mercury-sized moon. Titan's equatorial dark regions are visible in this view, along with faint, dark lineaments (line...
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Saturn's moon Titan
Titan 'T28' View
MESSENGER captured this departure sequence of Venus after a close flyby of the planet in 2007.
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Series showing the crescent of Venus growing smaller.
MESSENGER Bids Farewell to Venus
Only Cassini could provide this enchanting, natural color view of crescent Saturn, which gazes down onto the unlit side of the planet's spectacular rings.
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Only Cassini could provide this enchanting, natural color view of crescent Saturn, which gazes down onto the unlit side of the planet's spectacular rings.
Greetings from Saturn
This false color image from NASA's Dawn spacecraft of Ceres' Occator Crater shows differences in surface composition. The color blue is generally associated with bright material seems to be consist...
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Occator in False Color
Occator in False Color
An artist's concept of the European Space Agency's Huygens Probe en route to Titan after release from the NASA Cassini orbiter. Credit: NASA/JPL
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Color illustration of the Huygens Probe leaving the Cassini orbiter towards the yellowish moon Titan.
Huygens Probe Release
Complex and unique canyon systems appear to have been intricately carved into older terrain by the ample flow of liquid methane rivers on Saturn's moon Titan, as seen in this radar image taken by N...
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Complex and unique canyon systems appear to have been intricately carved into older terrain by the ample flow of liquid methane rivers on Saturn's moon Titan, as seen in this radar image
Southern Canyons of Titan
This global map of Saturn's moon Tethys was created using images taken during Cassini spacecraft flybys. The map is an equidistant (simple cylindrical) projection and has a scale of 293 meters (96...
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This global map of Saturn's moon Tethys was created using images taken during Cassini spacecraft flybys.
Map of Tethys - June 2012

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