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Master VersionHorizontal version. This is for use on any YouTube or non-YouTube platform where you want to display the video horizontally. Vertical VersionThis vertical version of the episode is for IGTV or Snapchat. The IGTV episode can be pulled into Instagram Stories and the regular Instagram feed. Though our galaxy is an immense city of at least 200 billion stars, the details of how they formed remain largely cloaked in mystery. Scientists know that stars form from the collapse of huge hydrogen clouds that are squeezed under gravity to the point where nuclear fusion ignites. But only about 30 percent of the cloud’s initial mass winds up as a newborn star. Where does the rest of the hydrogen go during such a terribly inefficient process?For more information, visit https://nasa.gov/hubble. Credit: NASA's Goddard Space Flight Center Paul Morris: Lead Producer Additional Visualizations:Zoom In To Star Formation: ESA, Silicon WorldsWide Image of Orion Complex: Image courtesy of Rogelio Bernal Andreo, DeepSkyColors.comHerschel and Rosette Nebula: ESA - C. CarreauSpace Cloud: ESA/Hubble (M. Kornmesser & L. L. Christensen)Zoom out of Milky Way: ESA, Silicon WorldsMusic Credits: "Winter Solstice" by Laetitia Frenod [SACEM] via Koka Media [SACEM], Universal Publishing Production Music France [SACEM], and Universal Production Music. Related pages