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    The larger the area of a habitat patch, the greater the effect of the surrounding

    intuitively true. imagine the ratio of size of the patch to size of its surroundings. larger area for the patch means this ratio increases, even if the surrounding environment is essentially unbounded. take this example also: a crocodile estuary that affects movements of animals across a...
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    please help with this Astronomy question?

    4AU = 5.984e8 km; pi radian=180° 2x arctan(.5 x 141 000 / 5.98400e8) x (180 / pi) x 60 = 0.810 arc minutes
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    Discuss radiation and how it is measured?

    radiation is energy propagating through free space or a medium. depending on wavelength, this can be measured in a number of ways. various types of radio equipment can be used to measure long electromagnetic wave radiation; optical instruments are used for infra-red to visible and UV light...
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    how do i predict, accurately, the motion of a space craft in our solar system?

    i want to plan an interplanetary mission. i know this will mean several assumptions and decisions; i'm not a whiz at the maths, so what free software exists that will help me? what do i need to do to make this a reality?
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