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"Hundreds of thousands of self-professed science supporters turned out to over 600 iterations of the March for Science around the world this weekend."
source: Slate.com
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Source: NASA/Goddard Space Flight Centre
New data from NASA’s Cassini mission, combined with measurements from the two Voyager spacecraft and NASA’s Interstellar Boundary Explorer, or IBEX, suggests that our sun and planets are surrounded by a giant, rounded system of magnetic field from the sun — calling into question the alternate view of the solar magnetic fields trailing behind the sun in the shape of a long comet tail.

The sun releases a constant outflow of magnetic solar material — called the solar wind — that fills the inner solar system, reaching far past the orbit of Neptune. This solar wind creates a bubble, some 23 billion miles across, called the heliosphere. Our entire solar system, including the heliosphere, moves through interstellar space. The prevalent picture of the heliosphere was one of comet-shaped structure, with a rounded head and an extended tail. But new data covering an entire 11-year solar activity cycle show that may not be the case: the heliosphere may be rounded on both ends, making its shape almost spherical.

“Instead of a prolonged, comet-like tail, this rough bubble-shape of the heliosphere is due to the strong interstellar magnetic field — much stronger than what was anticipated in the past — combined with the fact that the ratio between particle pressure and magnetic pressure inside the heliosheath is high,” said Kostas Dialynas, a space scientist at the Academy of Athens in Greece and lead author on the study.

Journal Reference:
K. Dialynas, S. M. Krimigis, D. G. Mitchell, R. B. Decker, E. C. Roelof. The bubble-like shape of the heliosphere observed by Voyager and Cassini. Nature Astronomy, 2017; 1 (5): 0115
http://dx.doi.org/10.1038/s41550-017-0115
https://www.nature.com/articles/s41550-017-0115

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