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You take a spectrum of a star. Which of the following cannot be used to measure its surface temperature? A. Peak wavelength of its continuous spectrum B. Color of its continuous spectrum in the visible band C. Presence and intensities of spectral lines D. Widths of spectral lines E...

Every year, Proxima Centari, the closest star to the sun, is observed to move 1.5 arcseconds with respect to the background stars for six months, followed by a return to its original position over the course of the next six months. How far away is Proxima Centari? [diameter of Earth's orbit = 2...