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The Milky Way Galaxy

This illustration shows astronomers’ current understanding of the large-scale structure of the Milky Way. Stars and star-forming regions are largely grouped into spiral arms. Measuring the shape, size, and number of spiral arms is a challenge because Earth is locate inside the galaxy. (NASA/JPL-Caltech)

This illustration shows astronomers’ current understanding of the large-scale structure of the Milky Way. Stars and star-forming regions are largely grouped into spiral arms. Measuring the shape, size, and number of spiral arms is a challenge because Earth is locate inside the galaxy. (NASA/JPL-Caltech)

A contingent of stars and star-forming clouds was found jutting out from the Milky Way’s Sagittarius Arm. The inset shows the size of the structure and distance from the Sun. (NASA/JPL-Caltech)