Tag: cosmic distance ladder
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Universe Expansion Rate: Sharpening H0 Measurements
New precision in measuring the cosmos’ expansion In a landmark effort to pin down the rate at which the universe is expanding, a diverse team of astronomers has achieved one of the most precise independent measurements to date. By combining observations from a suite of ground- and space-based telescopes, including the W. M. Keck Observatory…
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How Far Is That Star? Understanding Cosmic Distances Under a Dark Sky
Introduction: A Simple Question, A Vast Universe How far is that star? It’s a question that invites wonder and invites the scientific mind to step into a realm where distances are measured not in miles or kilometers, but in light-years. When observers experience a truly dark sky, the stars appear closer and more tangible. Yet…