Until relatively recently, it was thought that our neighboring galaxy, Andromeda, was far larger than the Milky Way.
New scientific findings are much more intriguing when they turn widely accepted facts on their heads.
To estimate the mass of dark matter in the Milky Way, astronomers measured the velocity of globular clusters — dense star clusters that orbit the spiral disc of the galaxy. Using Gaia — a space probe designed to produce a precise 3D map of the Milky Way — the scientists were able for the first time to evaluate three-dimensional measurements of cluster velocities.
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