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Published in 2017 at "Science"
DOI: 10.1126/science.358.6360.183-a
Abstract: Milky Way Galaxy![Figure][1] Nearly a complete rotation of a Milky Way spiral arm has been traced. ILLUSTRATION: NASA JPL Direct measurements of distances to astronomical sources rely on parallax, which can usually only be measured…
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Keywords:
measuring far;
side galaxy;
far side;