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Article
Changing music of the spheres
Feynman's Lost Lecture: The Motion of Planets Around the Sun.
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The pulsar remains hidden
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Light ring grounded
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RGO move OK
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Future of UK observatory
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Astronomical oddities
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Optical Identification of Cygnus X-1
THE star HD 226868 is coincident, within a 3″ error, with a faint and possibly variable radio source which itself is coincident, though with a large uncertainty, with the Cygnus X-1 pulsating X-ray star1.