2015年9月22日 星期二

Checking in on Uranus and Neptune, September 2015 edition

There are no spacecraft at Uranus or Neptune, and there haven't been for 30 and 25 years, respectively. So we depend on Earth-based astronomers to monitor them, including Damian Peach.

from Planetary Society Blog http://ift.tt/1L3R7zJ
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