Ring Tones From The Edge

Another dazzling result  debuted at the annual meeting of the American Astronomical Society. The Hubble Space Telescope has recorded a double Einstein ring, a cosmic mirage  arising from the gravitational lensing predicted by Einstein in the theory of general relativity.

Hubble has found a triplet of galaxies  2 , 6  and 11 billion light-years away--lying exactly behind each other in the line of sight from the solar system  The light from the more distant is bent by the gravity of the nearer one, creating  two nested rings. If more double rings are found, spectroscopy  may tell if  the expansion rate of the universe has changed over time.

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