Our universe is held together with an invisible "glue" – what we call dark matter.
Most galaxies are made up of mostly dark matter. Astronomers can gain insight into what this substance is, and how it impacts a galaxy's evolution, by understanding how dark matter is distributed within a galaxy.
Enter Hubble. With its long-running mission, scientists have the unique ability to examine data that spans 18 years to measure the motion of stars in the Draco dwarf galaxy, located about 250,000 light-years away. Portions of the galaxy are seen in these two Hubble views.
Using Hubble data, a team of astronomers built the most accurate three-dimensional map of the stars' movements. These measurements will help shed light on the mysterious qualities and behavior of dark matter.

Image credit: NASA, ESA, Eduardo Vitral (STScI), Roeland van der Marel (STScI), Sangmo Tony Sohn (STScI), DSS; Image Processing: Joseph DePasquale (STScI)
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