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What is the role of light in astronomy?

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Light: The Raw Data of the Universe In astronomy, light is not merely something we see. It is the primary data stream of the universe. Because we cannot visit distant galaxies, we rely entirely on electromagnetic radiation to construct our models of cosmic reality. Think of light as a carrier wave that encodes the temperature, … Read more

astronomy – How do astronomers use gravitational lensing to study the universe?

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How Astronomers Use Gravitational Lensing to Study the Universe Gravitational lensing is not just a theoretical concept; it is the most powerful natural telescope available to modern science. When a massive structure—such as a galaxy cluster—sits between Earth and a distant light source, its gravity acts like a physical lens. This gravity warps space-time, bending … Read more