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Scientists are reexamining Uranus
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“Our understanding of the Uranus system may be more limited than previously thought,” according to the authors of a study published Monday in the journal Nature Astronomy.
The study’s authors say the NASA spacecraft passed Uranus just after an intense solar wind event that compressed its magnetosphere, emptying it of plasma and leaving it with “highly excited electron radiation belts.”
The study also offers hope for the cold and windy planet’s five major moons: They could have signs of geological activity after all. Originally, scientists had figured that the lack of plasma on Uranus meant that the moons were inert.
Fran Bagenal, an astrophysics and planetary science professor at the University of Colorado at Boulder and a member of the Voyager program’s plasma science team, said in an email that at the time of the flyby, the team was “knocked over by the weirdness of a magnetic field” so tilted from the planet’s spin axis and they “did not think about much else.”
The low density of plasma didn’t strike her as unusual at the time because the Uranus moons were very small. Bagenal said she is still skeptical that there could be any liquid layers under the ice on the moons — the ice layers are hundreds of miles thick and “way too cold to harbor even primitive life forms.”
Caption from article by Rachel Pannett.
The study’s authors say the NASA spacecraft passed Uranus just after an intense solar wind event that compressed its magnetosphere, emptying it of plasma and leaving it with “highly excited electron radiation belts.”
The study also offers hope for the cold and windy planet’s five major moons: They could have signs of geological activity after all. Originally, scientists had figured that the lack of plasma on Uranus meant that the moons were inert.
Fran Bagenal, an astrophysics and planetary science professor at the University of Colorado at Boulder and a member of the Voyager program’s plasma science team, said in an email that at the time of the flyby, the team was “knocked over by the weirdness of a magnetic field” so tilted from the planet’s spin axis and they “did not think about much else.”
The low density of plasma didn’t strike her as unusual at the time because the Uranus moons were very small. Bagenal said she is still skeptical that there could be any liquid layers under the ice on the moons — the ice layers are hundreds of miles thick and “way too cold to harbor even primitive life forms.”
Caption from article by Rachel Pannett.
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