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... unless replenished with fuel. The old theory that the comets are the sun's fuel is revived in another form. The comet of Encke is gradually approaching the sun in a spiral course, and ... the sun, which all comets show in a striking form, and which the analysis of M. Faye has proved to be explanatory of the shortening periods of Encke's comet. It is believed that the zones of meteorites, approaching the sun in a spiral course, like that of a comet, gradually supply the sun with ...

... images of an April 2007 collision between a comet and a solar hurricane, marking the first time that scientists had observed such an event. Encke’s comet, traveling in the orbit of Mercury, had ... fields around a comet, causing the comet fields to link together suddenly. This sudden reconnection releases a burst of energy that detaches the comet’s tail. Angelos Vourlidas of the U.S. Naval Research Laboratory ...

What is believed to have been a large piece of Encke's comet strikes the Tunguska region of Siberia during the Beta Taurid meteor shower. Evidence suggests that it exploded almost nine kilometers above the surface causing a massive air blast downwards. The blast destroyed approximately 2000 square kilometers of forested tundra.

... 1982 mission to rendezvous with Halley’s Comet , had decided on a 1985 mission to rendezvous with comet Tempel 2 that would include a flyby of Halley’s Comet and deployment of a probe into ... been considering as a new start for FY81 a 1985 mission using ion propulsion to comet Encke. In testimony before the House Space Subcommittee, Associate Administrator Dr. Noel Hinners had said NASA ...

... . Other plans under consideration were a flyby and rendezvous with Comet Encke and a landing on the nucleus, a flyby of Haley's Comet in 1985, and two missions to asteroids in 1986. Of ... exploration and 753 for earth orbit. Scientific satellites for earth orbit were Large Space Telescope s, High Energy Astronomical Observatories, Large Solar Observatories, Large Radio Astronomy Observatories, and x-ray telescopes ... foreign users. The large number of contemplated missions, even with the increasing number of U.S.S.R. launches, was expected to have very little impact on the environment. Effects of the ...

... . 2), 1996, p. 1671-1682 Unified analytical solutions to two-body problems with drag, Breiter, S.; Jackson, A. A., ''Monthly Notices of the Royal Astronomical Society'', Volume 299, Issue 1, pp ... Evolution of Dust from Comet Encke, A.A. Jackson and H. A. Zook, 21st DPS meeting, Providence R.I., Nov. 1989. Long Time Orbital Dynamics of Dust Grains from Comets Encke and Halley, A ... , Texas, March 1991. Dust particles from Comets and Asteroids Collected at the Earth’s Orbit: Parent-Daughter Relationships. A. Jackson and Zook, H. A., Asteroids, Comets and Meteors meeting, Flagstaff, Arizona, 1991. Spatial ...

... satellite orbiting Venus, Pioneer Venus Orbiter, briefly tilted to watch passing comet Encke and sent back information showing that the comet was losing water at a rate three times higher than earlier calculations ... university built the spectrometer and calculated the comet's rate of water loss. Johann Encke, a German astronomer who calculated the comet's orbit in 1818, noted that the comet was behaving abnormally, with the time ...

... method of obtaining samples of comets by sending spacecraft to rendezvous with comet to fly through comet's head or tail, Washington Post reported. ass Planetary Programs Director Robert S. Kraemer, had said that "best ... feasible, Post said. Comet d'Arrest would fly by in 1976 and and 1982, comet Encke in 1983, comet Giacobini-Zinner in 1985. Comet "most astronomers would like to probe" was Halley's, due close to ...

... approaches to comets Encke, Schwassmann-Wachmann-3, and d'Arrest~ to analyze the composition of comets. Engineers had designed the spacecraft to capture 4-meter-resolution (13-foot-resolution) images of the comets' ... 's observations with data captured by Earth-based or Earth-orbital telescopes. In addition, NASA planned for CONTOUR to collect data on gas and dust from the environment near the comets ...

... Earth-orbiting space and into a heliocentric trajectory where it would eventually encounter comets Encke, Schwassmann-Wachmann, and d'Arrest. At the time of its scheduled ignition, ... ESA astronauts Pedro Duque , Léopold Eyharts , Paolo A. Nespoli , and Thomas Reiter ; Japan's NASDA astronauts Takao Doi , Satoshi Furukawa , Aikihiko Hoshide , and Koichi Wakata ; and NASA ...

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