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Nasa's Infrared Observatory Measures Expansion of Universe
The cosmic distance ladder, symbolically shown here in this artist's concept, is a series of stars and other objects within galaxies that have known distances.
Credit: NASA/JPL-Caltech
Astronomers using NASA's Spitzer Space Telescope have announced the most precise measurement yet of the Hubble constant, or the rate at which our universe is stretching apart.
From Jet Propulsion Laboratory/NASA
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