Exoplanets: How We Discovered New Worlds and What They Mean for Humanity
For most of human history, every known planet orbited our Sun. Astronomers have now confirmed more than 6,000 worlds beyond our Solar System, usually by detecting tiny effects on starlight rather than photographing the planets themselves. How can tiny changes in a star’s light reveal an unseen planet, and what might these discoveries mean for life, planetary systems and humanity?
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