Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Our Galaxy is being invaded. Recent observations indicate that in the next 100 million years, the Sagittarius Dwarf galaxy will move though the disk of our own Milky Way Galaxy yet again . One possibility is that Sgr contains a great deal of low-density dark matter that hold it together gravitationally during these collisions.
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