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بغيت قطعه عن اي عالم او مستكشف

مثل ابن سيناء

ابن بطوطه

ماجلان


اي واحد غير


في حدود ورقة واحده مال دفتر

يعني نصف ورقه


ان شاء الله ماتردوني خايب

عن ماجلان

Mission Summary
The Magellan spacecraft, named after the sixteenth-century Portuguese explorer whose expedition first circumnavigated the Earth, was launched May 4, 1989, and arrived at Venus on August 10, 1990. Magellan's solid rocket motor placed it into a near-polar elliptical orbit around the planet. During the first 8-month mapping cycle around Venus, Magellan collected radar images of 84 percent of the planet's surface, with resolution 10 times better than that of the earlier Soviet Venera 15 and 16 missions. Altimetry and radiometry data also measured the surface topography and electrical characteristics.
During the extended mission, two further mapping cycles from May 15, 1991 to September 14, 1992 brought mapping coverage to 98% of the planet, with a resolution of approximately 100m.

Precision radio tracking of the spacecraft will measure Venus' gravitational field to show the planet's internal mass distribution and the forces which have created the surface features. Magellan's data will permit the first global geological understanding of Venus, the planet most like Earth in our solar system.

وهذا عن ابن بطوطة

http://www.ummah.net/history/scholars/ibn_battuta/

http://www.infoplease.com/ce6/people/A0824828.html

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من الاوائل في مساعدتنااااا



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