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  1. #1

    11 - 04 - 2006
    69



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    http://www.space.com/
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    : retrograde motion ..... !!! !!
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    http://www.space.com/spacewatch/mar...ade_030725.html
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    For the past few weeks, Mars has appeared to slow in its eastward trajectory, almost seeming to waver, as if it had become uncertain.
    On Wednesday, July 30, that steady eastward course will come to a stop. Then, for the next two months, the planet will move backward against the star background - toward the west. On Sept. 29 it will pause again before resuming its normal eastward direction.
    All the planets exhibit retrograde motion at one time or another. Ancient astronomers were unable to come up with a satisfactory explanation for it. The motion is tricky. For one thing, while behaving in this strange manner, Mars will also appear to deviate somewhat from its normal course; the retrograde motion will appear to bring it a little below its regular orbital track.
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  2. #2

    25 - 09 - 2005
    3,045

    اللهم إنا نسألك العفو والعاااااااافية 00

    بارك الله فيك عزيزتي 00

  3. #3

    06 - 01 - 2006
    2,494


  1. tilkalora :
    : 15
    : 2008-07-15, 16:00
  2. !! !!
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    : 7
    : 2008-01-31, 23:23
  3. : !!
    spring :
    : 12
    : 2006-08-18, 16:49

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