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Romulo Binuya
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How do astronomers measure cosmic distance, say 7 billion light-years?
http://www.space.com/17399-gamma-ray-photons-quantum-spacetime.html
http://www.space.com/17399-gamma-ray-photons-quantum-spacetime.html
Cosmic distance measurement is a branch of astrophysics that focuses on determining the distances between celestial objects, such as stars, galaxies, and clusters, in the universe.
Measuring cosmic distances allows us to understand the scale and structure of the universe, as well as the evolution and dynamics of celestial objects. It also helps us to test theories and models of the universe.
There are several methods used to measure cosmic distances, including parallax, redshift, standard candles, and cosmic rulers. Each method relies on different physical properties and principles to calculate distances.
Cosmic distance measurements can vary in accuracy depending on the method used. Generally, measurements are most accurate for objects within our own galaxy, but become less precise for more distant objects.
One limitation of cosmic distance measurement is that it relies on assumptions and models, which can introduce uncertainty into the results. Additionally, some methods are limited by the maximum distance they can measure, making it difficult to accurately measure distances of very distant objects.