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A test of general relativity using radio links with the Cassini spacecraft
According to general relativity, photons are deflected and delayed by the curvature of space-time produced by any mass. The bending and delay are proportional to γ + 1, where the parameter γ is unityExpand
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Direct activation of cardiac pacemaker channels by intracellular cyclic AMP
CYCLIC AMP acts as a second messenger in the modulation of several ion channels1–9 that are typically controlled by a phosphorylation process10. In cardiac pacemaker cells, adrenaline andExpand
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Gravity Field, Shape, and Moment of Inertia of Titan
Titan Through to the Core Gravity measurements acquired from orbiting spacecraft can provide useful information about the interior of planets and their moons. Iess et al. (p. 1367; see theExpand
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JUpiter ICy moons Explorer (JUICE): An ESA mission to orbit Ganymede and to characterise the Jupiter system
Past exploration of Jupiter's diverse satellite system has forever changed our understanding of the unique environments to be found around gas giants, both in our solar system and beyond. TheExpand
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The Gravity Field and Interior Structure of Enceladus
Inside Enceladus Saturn's moon Enceladus has often been the focus of flybys of the Cassini spacecraft. Although small—Enceladus is roughly 10 times smaller than Saturn's largest moon, Titan—EnceladusExpand
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The Tides of Titan
Getting to Know Titan Gravity-field measurements provide information on the interior structure of planets and their moons. Iess et al. (p. 457; published online 28 June) analyzed gravity data fromExpand
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Measurement of Jupiter’s asymmetric gravity field
The gravity harmonics of a fluid, rotating planet can be decomposed into static components arising from solid-body rotation and dynamic components arising from flows. In the absence of internalExpand
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Measurement and implications of Saturn’s gravity field and ring mass
Cassini's last look at Saturn's rings During the final stages of the Cassini mission, the spacecraft flew between the planet and its rings, providing a new view on this spectacular system (see theExpand
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Spacecraft Doppler tracking: Noise budget and accuracy achievable in precision radio science observations
[1] We discuss noise in Doppler tracking of deep space probes and provide a detailed noise model for Doppler radio science experiments. The most sensitive current experiments achieve fractionalExpand
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