Beyond their individual lives, stars are social celestial bodies, often found in binary or multiple systems where two or more stars orbit a common center of mass. These stars are organized into massive star clusters and further grouped into galaxies, which can contain hundreds of billions of stars held together by gravity. The light we see from these distant suns can take years or even millennia to reach Earth, meaning that looking up at the night sky is essentially looking back in time. By studying the unique spectral signatures of starlight, astronomers can determine a star’s chemical composition, temperature, and movement. This ongoing research continues to reveal how these “cosmic engines” drive the evolution of the universe by recycling matter and energy across the cosmos.
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