摘要: This article presents the results of a fit of a model of the Martian satellite orbits to earthbased and spacecraft-based observations. An assessment of the orbit accuracies is given and the orbits are compared with those obtained by previous investigators.关键词:...
orbit (ˈɔːbɪt) n 1. (Astronomy) astronomy the curved path, usually elliptical, followed by a planet, satellite, comet, etc, in its motion around another celestial body under the influence of gravitation 2. a range or field of action or influence; sphere: he is out of my ...
Present knowledge of the Moon's gravitational field is briefly reviewed. The Report then describes the main perturbations of the orbit of a lunar satellite caused by low-order terms in the lunar gravitational potential and by the Earth. Techniques for investigating the lunar potential are outlined....
Asatelliteisobjecttravellinginorbitroundanotherobjectinspace( )an;an;/an;an;thethe;an;thean;the;/ 相关知识点: 试题来源: 解析 A,考查冠词的用法,第一个空和第二个空表示类别,object"物体",orbit"轨道"都是可数名词,并都以元音音素开头,故前使用不定冠词an;第三个空考查固定搭配in space"在太空中...
The centripetal force is provided by the engine of the satellite C. The centripetal force is zero because the satellite is in a state of equilibrium D. The centripetal force is provided by the air resistance 相关知识点: 试题来源: 解析 A。解析:在卫星绕地球做圆周运动时,根据圆周运动的力学...
The satellite was launched into orbit(轨道)around the moon. 相关知识点: 试题来源: 解析 答案:orbit.分析句子的结构可知,本句考查名词的识记和拼写,根据汉语提示可知答案为orbit.Mars and Earth have orbits which change with time 火星与地球的运行轨道随着时间而变化. 卫星被发射到围绕月球运转的轨道....
题目A satellite is orbiting the Earth. What force keeps it in orbit? A. Frictional force B. Magnetic force C. Gravitational force D. Nuclear force 相关知识点: 试题来源: 解析 C。解析:卫星绕地球运行是因为地球对卫星的万有引力提供了向心力,使其能够在轨道上运行。A选项,太空中卫星几乎不受摩擦...
The moon is the earth's largest and only natural satellite. A satellite is a small body that goes around a planet. The first man-made satellite went into the orbit in 1963. By 1968 there were over three hundredsatellites in the orbit. Some satellites send back weather pictures. Others sen...
It has beenpushing one side of its orbit farther away from the Earth than the other.Since last week, LightSail 2 has been slowly changing the position of itssail to drive the satellite through space.LightSail 2 has moved so much that now the far point of its orbit isover a mile (1.7 ...
EXPLORER 1 SATELLITENo Abstract AvailableZadunaisky, P. E.NASA (non Center Specific)Pedro E. Zadunaisky, `The Orbit of Satellite 456 Alpha (Explorer I) during the First 10500 Revolutions', Smithsonian Astrophysical Observatory (SAO) Special Report #50, October 1960....