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Galaxies

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Official Audio Prompt

Our Milky Way galaxy is on the heavy side. We have hundreds of billions of stars, and an even more [massive:offensive] amount of dark matter. With just 1,000 stars, the dwarf galaxy Segue 2 becomes the smallest one known. Researchers [published:printed] measurements of the galaxy's size in the Astrophysical Journal [Segue:Stage] 2 is one of dozens of "companion" galaxies that orbit the Milky Way. Scientists who model how galaxies form [expect:detect] there to be thousands of small galaxies [orbiting:circling] nearby, even if most are too faint to see with existing technology.

Sample Answer & Audio Transcript

Our Milky Way galaxy is on the heavy side. We have hundreds of billions of stars, and an even more massive amount of dark matter. With just 1,000 stars, the dwarf galaxy Segue 2 becomes the smallest one known. Researchers published measurements of the galaxy's size in the Astrophysical Journal Segue 2 is one of dozens of "companion" galaxies that orbit the Milky Way. Scientists who model how galaxies form expect there to be thousands of small galaxies orbiting nearby, even if most are too faint to see with existing technology.
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