منابع مشابه
The Clifford Space Geometry behind the Pioneer and Flyby Anomalies
It is rigorously shown how the Extended Relativity Theory in Clifford spaces (C-spaces) can explain the variable radial dependence ap(r) of the Pioneer anomaly; its sign (pointing towards the sun); why planets don′t experience the anomalous acceleration and why the present day value of the Hubble scale RH appears. It is the curvature-spin coupling of the planetary motions that hold the key. The...
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We make preliminary estimates to assess whether the recently reported flyby anomaly can be attributed to dark matter interactions. We consider both elastic and exothermic inelastic scattering from dark matter constituents; for isotropic dark matter velocity distributions, the former decrease, while the latter increase, the final flyby velocity. The fact that the observed flyby velocity anomaly ...
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Geospatial semantics as a research field studies how to publish, retrieve, reuse, and integrate geo-data, how to describe geo-data by conceptual models, and how to develop formal specifications on top of data structures to reduce the risk of incompatibilities. Geo-data is highly heterogeneous and ranges from qualitative interviews and thematic maps to satellite imagery and complex simulations. ...
متن کاملThulium anomalies and rare earth element patterns in meteorites and Earth: Nebular fractionation and the nugget effect
This study reports the bulk rare earth element (REEs, La–Lu) compositions of 41 chondrites, including 32 falls and 9 finds from carbonaceous (CI, CM, CO and CV), enstatite (EH and EL) and ordinary (H, L and LL) groups, as well as 2 enstatite achondrites (aubrite). The measurements were done in dynamic mode using multi-collector inductively coupled plasma mass spectrometers (MC-ICPMS), allowing ...
متن کاملThe Puzzle of the Flyby Anomaly
Close planetary flybys are frequently employed as a technique to place spacecraft on extreme solar system trajectories that would otherwise require much larger booster vehicles or may not even be feasible when relying solely on chemical propulsion. The theoretical description of the flybys, referred to as gravity assists, is well established. However, there seems to be a lack of understanding o...
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ژورنال
عنوان ژورنال: Physics Today
سال: 2009
ISSN: 0031-9228,1945-0699
DOI: 10.1063/1.3248495