A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the American Astronomical Society in January 1925, a paper read by one of his ...
The Milky Way is a barred spiral galaxy roughly 100,000 light-years in diameter, housing up to 400 billion stars. Our Solar System sits in the Orion Arm, orbiting the center at 220 km/s. Recent 2025 ...
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