The Star That Changes Its Brightness

Variable stars are stars whose brightness changes over time. These changes can happen because the star expands and contracts, or because something passes in front of it. Astronomers study these variations to learn more about stars and the universe. #VariableStarStarFactsAstronomySpaceFactsUniverseSpaceScienceStellarEvolutionCosmicMysteryDeepSpaceNASAScienceFactsAmazingUniverseAstrophysicsStarsSpaceExplorationSpaceShortsYouTubeShorts