Results 161 to 170 of about 3,068 (209)
Atmospheric Planetary Probes and Balloons in the Solar System
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 2011 A primary motivation for in situ probe and balloon missions in the solar system is to progressively constrain models of its origin and evolution. Specifically, understanding the origin and evolution of multiple planetary atmospheres within our solar system would provide a basis for comparative studies that lead to a better understanding of the origin ...
A Coustenis +13 more
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On the Reliability of Planetary Nebulae as Extragalactic Probes
AIP Conference Proceedings, 2005We report on the first 1D radiation‐hydrodynamics simulations aimed at exploring the metallicity dependance of the evolution of planetary nebulae. Using scaled mean abundances, based on Galactic disk objects, we found that for lower metallicities the nebulae become more dilute and prone to departures from thermal equilibrium because of the reduced wind
D Schönberner +2 more
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Basalts as Probes of Planetary Interior Redox State
Reviews in Mineralogy and Geochemistry, 2008Whether the redox state, quantified as oxygen fugacity, recorded in a planetary basalt is an accurate representation of the redox state of the planetary interior from which it was derived through partial melting, ascent, eruption and emplacement is a fundamental question in planetary geology. In the absence of mantle xenoliths in samples from the Moon,
Christopher D K Herd
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Mars Loss Could Sink Planetary Probes
Science, 1996The loss of Russia's Mars '96 probe, just hours after launch last weekend, may also have doomed the country's once proud planetary space program. Astrophysics projects are expected to get the upper hand as future missions compete for scarce funds.
Andrew Lawler
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Automatic Controls on Board Planetary Probes
IFAC Proceedings Volumes, 1983Abstract The planetary missions have highlighted the needs for automatic operations to be performed on board space vehicles. This paper presents the solutions adopted within the data handling subsystem for the ESA - ISPM and GIOTTO missions to satisfy the most demanding tasks related to the on-board autonomous actions.
A. Beretta, F. Longoni
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Galactic Planetary Nebulae as Probes of Radial Metallicity Gradients and Other Abundance Patterns
Astrophysical Journal, 2018 International audienceWe use planetary nebulae (PNe) as probes to determine the Galactic radial oxygen gradients and other abundance patterns. We select data homogeneously from recent data sets, including PNe at large Galactocentric distances. The radial
Letizia Stanghellini
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Planetary atmospheric determination utilizing a semipassive probe.
Journal of Spacecraft and Rockets, 1965A simple experiment has been conceived for providing highly accurate knowledge on the density/ and pres sur e/altitude profiles of planetary atmospheres, notably those of Mars and Venus. The experiment consists of a small, lightweight spherical probe injected into the planetary atmosphere either from a flyby spacecraft prior to planetary encounter or ...
FRANK HOLMAN, HAIM KENNET
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Probing Planetary Architectures with SPICE
Bulletin of the American Astronomical Society, 2023Understanding the formation and evolution of planetary systems is a challenging area of study, requiring high spatial resolution and special techniques to observe planets in formation in protoplanetary disks and the resulting disk/planet systems that are created. These systems provide a point of comparison to our own Solar System, in which we know that
Matthews, Brenda +9 more
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Future planetary probes for Jupiter and Saturn
Conference on Advanced Technology for Future Space Systems, 1979This paper discusses a study that was conducted to identify the technology developments that would allow deep atmospheric investigations of Jupiter and Saturn to proceed beyond currently planned investigations of the upper atmosphere (above 20 bars). The study considered a deep-probe mission that would provide the capability to scientificall y examine ...
A. BUTTS, J. MURPHY
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Bistatic radar probing of planetary surfaces
2009 IEEE Radar Conference, 2009Bistatic radar provides a simple, cost-effective way to obtain survey information about planetary surfaces on scales important to landers and rovers. The centimeter-scale waves interact most strongly with surface structure on similar and slightly larger scales yielding estimates of rms surface slopes ζ and material dielectric constant e (which can be ...
Richard A. Simpson +4 more
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