Posts Tagged ‘distance’
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When a large nearby object, such as a galaxy, blocks a distant object, such as another galaxy, the light can detour around the blockage. But instead of taking a single path, light can bend around the object in different routes. As the brightness of the background galaxy nucleus fluctuates, physicists measure light’s ebb and flow from the distinct paths, such as in the B1608+656 system imaged above. (Courtesy: Sherry Suyu/Argelander Institut für Astronomie)
STANFORD (US)—Using entire galaxies as lenses to look at other galaxies, researchers have a newly precise way to measure the size and age of the universe and how rapidly it is expanding, on a par with other techniques. Continue…
