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AUG 01, 2021

Volume 74, Issue 8

About the Cover

This artist’s impression depicts a protoplanetary disk surrounding a star. Material from the disk flows along the star’s magnetic field lines to strike the star’s surface. The ensuing flares can be observed both directly and as echoes once the light reaches and illuminates the inner disk. Timing the echoes yields the radius of the inner disk. Turn to the article by Sean Andrews on