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Is a Sun a Star or a Planet? How We Know — and What Could Change

Is a sun a star or a planet? While science now agrees the sun is a star, new telescopes may soon challenge how we define ...

A Planet Nine beyond Neptune? The hunt for the solar system’s hidden worlds

Nearly a century after Pluto’s discovery, astronomers are still searching for mysterious planets beyond Neptune - including a ...

Is there a Planet Nine beyond Neptune? Mapping the solar system’s hidden worlds

Nearly a century after Pluto’s discovery, astronomers are still hunting for mysterious planets beyond Neptune - including a ...