Physics/basic orbital capture (#8857)

* Added file basic_orbital_capture

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* added second source

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* updating DIRECTORY.md

* corrected spelling error

* Added file basic_orbital_capture

* added second source

* fixed spelling errors

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* added doctest

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* removed redundant constnant

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* added scipy imports

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* added doctests to capture_radii and scipy const

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* finalizing file. Added tests

* Update physics/basic_orbital_capture.py

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Co-authored-by: Christian Clauss <[email protected]>