The Twin Quasar is interesting because it is in fact the same object. The "A" version is a more or less straight light path from the object to Earth. The "B" object is a longer light path that is gravitationally lensed by several galaxies, esp YGKOW G1, which appears to merge with "B" and is why, I suspect, "B" appears slightly larger than "A" in the image. The light takes about 14 months longer to reach Earth on path "B" compared to "A".
Click on the image to get a closer view
John Evans
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