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http://www.davidreneke.com/?p=88836: Measuring a Black Hole is as Simple as ABC
David Reneke's World of Space and Astronomy

Direct link Measuring a Black Hole is as Simple as ABC

21 Aug 2017, 00:00 UTC
www.planetary.org-828296330: Celebrating the 40th anniversaries of the Voyager launches
The Planetary Society Blog

Direct link Celebrating the 40th anniversaries of the Voyager launches

17 Aug 2017, 23:07 UTC

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