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The spiral nature of the heliospheric magnetic field was noted earlier by Hannes Alfvén, [7] based on the structure of comet tails. The influence of this spiral-shaped magnetic field on the interplanetary medium ( solar wind ) creates the largest structure in the Solar System, the heliospheric current sheet.
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The word parkour derives from parcours du combattant (Obstacle course), the classic obstacle course method of military training proposed by Georges Hébert. [23] [24] [25] Raymond Belle used the term "les parcours" to encompass all of his training including climbing, jumping, running, balancing, and the other methods he undertook in his personal athletic advancement. [26]
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NGC 1365, also known as the Fornax Propeller Galaxy [2] or the Great Barred Spiral Galaxy, [3] is a double-barred spiral galaxy about 56 million light-years away [4] in the constellation Fornax. It was discovered on 2 September 1826 by Scottish astronomer James Dunlop .
The Euler spiral provides the shortest transition subject to a given limit on the rate of change of the track superelevation (i.e. the twist of the track). However, as has been recognized for a long time, it has undesirable dynamic characteristics due to the large (conceptually infinite) roll acceleration and rate of change of centripetal ...