Reid, Mark J., Menten, Karl M., Brunthaler, A., Zheng, X. W., Moscadelli, L., and Xu, Y. 2009. "Trigonometric Parallaxes of Massive Star-Forming Regions. I. S 252 ...
Try this experiment: extend your thumb at arm’s length and close one eye at a time. Your thumb will seem to ‘jump’ between two positions as you switch the eye that is closed. That jump is known as ...
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