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Signs of MACHOs in a Far-Off Galaxy

In a recent study, a galaxy being used as a so-called gravitational lens turned out to be more interesting than the quasar under examination. The radio signal focused by the lens--a normal spiral galaxy like our own Milky Way but 3.5 billion light-years from Earth--appeared to flicker. This odd behavior, the astronomers believe, is caused by compact, dark objects in a halo surrounding the lensing galaxy.