| 11. | Each time they pass through the identification world line.
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| 12. | The singularity is an end point in time, as in the world lines terminate at it.
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| 13. | Offering holding line for AMs and world lines.
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| 14. | During the 1991 Gulf War, the West and part of the Muslim world lined up against Iraq.
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| 15. | The momentarily co-moving inertial frames along the world line of a rapidly accelerating observer ( center ).
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| 16. | The relativistic length equal to, future-directed and tangent to the world line of the object in spacetime.
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| 17. | Deciduous trees from around the world line many of the parks, giving a display of autumn colour.
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| 18. | This is because world lines change from being time-like outside the static limit to being space-like inside it.
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| 19. | We also have two sets of null geodesics spiralling into two different events on the green world line.
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| 20. | As the world lined up against the rigidly Islamic Taliban, Musharraf moved to bring Pakistan's militant Muslims in line.
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