Magoffin County - Founder\u27s Day

Special Edition of Pioneer newspaper about the history of Magoffin County published on Spetember 4 1981

Why did they confess?: A study of the Radek-Piatakov trial

https://stars.library.ucf.edu/prism/1645/thumbnail.jp

Environmental Action Learn and Serve Program (EALSP) Evaluation Report

The Pioneer RESA\u27s Environmental Action Learn and Serve Program (EALSP) was designed to enhance middle school math and science programs. This enhancement was accomplished through the application of classroom instruction to real-life situations and the involvement of students in active community service. Begun in the 1994-1995 school year, EALSP has had three highly successful years of providing meaningful service learning projects, extensive curriculum development, and essential professional development activities for 25 schools in 14 systems, 50 teachers, and over 2,000 students

Could the Pioneer anomaly have a gravitational origin?

If the Pioneer anomaly has a gravitational origin, it would, according to the equivalence principle, distort the motions of the planets in the Solar System. Since no anomalous motion of the planets has been detected, it is generally believed that the Pioneer anomaly can not originate from a gravitational source in the Solar System. However, this conclusion becomes less obvious when considering models that either imply modifications to gravity at long range or gravitational sources localized to the outer Solar System, given the uncertainty in the orbital parameters of the outer planets. Following the general assumption that the Pioneer spacecraft move geodesically in a spherically symmetric spacetime metric, we derive the metric disturbance that is needed in order to account for the Pioneer anomaly. We then analyze the residual effects on the astronomical observables of the three outer planets that would arise from this metric disturbance, given an arbitrary metric theory of gravity. Providing a method for comparing the computed residuals with actual residuals, our results imply that the presence of a perturbation to the gravitational field necessary to induce the Pioneer anomaly is in conflict with available data for the planets Uranus and Pluto, but not for Neptune. We therefore conclude that the motion of the Pioneer spacecraft must be non-geodesic. Since our results are model independent within the class of metric theories of gravity, they can be applied to rule out any model of the Pioneer anomaly that implies that the Pioneer spacecraft move geodesically in a perturbed spacetime metric, regardless of the origin of this metric disturbance.Comment: 16 pages, 6 figures. Rev. 3: Major revision. Accepted for publication in Phys. Rev. D. Rev. 4: Added two reference

Pioneer Venus

Venus before Pioneer, the Pioneer Venus mission, Pioneer Venus spacecraft, scientific investigation, mission to Venus scientific results, and results of Soviet studies of Venus are addressed. A chronology of exploration of Venus from Earth before the Pioneer Venus mission and Venus nomenclature and mythology are provided