Our neighbor, Galaxy M101, is a gorgeous pinwheel, some 21 million light-years distant, and can be seen in the constellation Ursa Major. Some think that Van Gogh depicted this galaxy in A Starry Night.
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The diaphanous arms of the galaxy, breathtakingly immense, spiral outwards into emptiness. Each arm is made of uncounted stars, each star is matter, but where does the galaxy begin? where does it end? Or like Zeno's arrow, maybe it never reaches an end.