Astronomers Find a Rare "Einstein Cross"
Astronomers have found a rare "Einstein Cross" gravitational lens. It shows four mages of a distant galaxy in the early universe.
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Astronomers have found a rare "Einstein Cross" gravitational lens. It shows four mages of a distant galaxy in the early universe.
A massive galaxy has created a rare distortion in the path of light that has traveled billions of years to reach us from a more distant galaxy.
Astronomers use a variety of techniques and instruments — collectively referred to as the cosmic distance ladder — to measure cosmic distances because it is a difficult task.Type Ia...
Supernova Refsdal blew up once but burst into view at least five times. The timing of its appearances provides clues to how fast the universe is growing.
Thanks to what is known as "gravitational lensin," a cluster of galaxies has bent light from a very distant supernova, causing it to appear four different times in four different places.