That's why astronomers are excited about a captivating new discovery: a face-on, full-fledged spiral galaxy that's a staggering 10.7 billion light years away - meaning the image is 10.7 billion years old. In order to confirm that the galaxy was truly the spiral shape that the Hubble image suggested it was, Law and his colleagues had to play with light another way. How did the galaxy grow up so fast? Galaxies spin for the same reason the Earth does: angular momentum that imparts a permanent rotation as primal dust contracts into discrete bodies. "It's probably telling us the importance of mergers in helping produce or at least accentuate the spiral structure we see in galaxies." The Milky Way too is attended by a dwarf galaxy, which may have played a formative similar role.
Source: TIME
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