May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986space...2...44m&link_type=abstract
Space (ISSN 0267-954X), vol. 2, Mar.-May 1986, p. 44-47.
Physics
Space Exploration, Uranus (Planet), Voyager 2 Spacecraft, Dust, Hydrogen, Space Commercialization, Uranus Atmosphere, Uranus Rings, Uranus Satellites
Scientific paper
In January 1986 Voyager 2 made its closest approach to Uranus, emerging with new information in such areas as ring and satellite number, rotation, temperature and hydrogen content. Nine rings were known to exist around Uranus before the Voyager 2 encounter; the spacecraft discovered three more. Ten new satellites were found, which were added to the original five. It became possible to fix the rotation period at 16.8 hrs, and the magnetic axis was found to be 55 deg away from the axis of rotation, with a northern polarity of the south magnetic pole. A feature unique to Uranian temperature variation is that the sunlit pole was found to be cooler than the night pole. The atmosphere, initially thought to have a helium content of 40 percent, contains a more conventional 10 percent. Moreover, present in the atmosphere is an electroglow, created by collisions between electrons and hydrogen molecules. It is noted that the Voyager 2, currently on its way to Neptune, after its initial launching in 1977, is still functioning perfectly.
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