Unveiling the Mystery of 'Ghost Stars' in the Milky Way's Core

Scientists have discovered the reason behind the mysterious alignment of planetary nebulas in the galactic bulge at the center of the Milky Way. Using images from the Hubble Space Telescope, researchers found that the alignment is only present in planetary nebulas with a close stellar companion. The alignment is absent in planetary nebulas without a companion star, suggesting that the rapid orbital motion of the companion star creates the alignment. This finding provides insight into the complex process of star formation in the Milky Way's bulge region.