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Tiny, faint dwarf galaxies, many with as few as a thousand stars, swoop around our cosmic neighborhood on long graceful circuits. It's unclear exactly how many there are, but there should be a lot more than the
That's because the two new satellites, named Virgo III and Sextans II, were discovered in a region of space already crowded with more dwarf galaxies than models of"This discovery rate of ultra-faint dwarfs is much higher than that predicted from the recent models for the expected population of Milky Way satellites in the framework of cold dark matter models, thereby suggesting that we encounter a 'too many satellites' problem.
Dark matter-based models also give us fairly detailed predictions about how many satellite galaxies we should expect to see in specific places, and this is where Virgo III and Sextans II are posing a problem. The two new galaxies bring the total in that region to nine. Even before their discovery, the number of satellites there was too high to explain.
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