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Article summary and answer:
According to the article, estimating the mass of the Milky Way galaxy is a challenging task due to the invisible dark matter that makes up a significant portion of its mass. However, a team of astronomers has provided a new estimate by observing the motion of stars in the galaxy. They found that the Milky Way has a mass of about 1.5 trillion solar masses, with 90% of it being dark matter.
Answer: The Milky Way galaxy has a mass of about 1.5 trillion solar masses, with 90% of it being dark matter.