Galaxies Surrounded by Overlapping Bubbles of Ionized Hydrogen (IMAGE)

NASA/Goddard Space Flight Center

Galaxies Surrounded by Overlapping Bubbles of Ionized Hydrogen

Caption

Inset: This illustration of the EGS77 galaxy group shows the galaxies surrounded by overlapping bubbles of ionized hydrogen. By transforming light-quenching hydrogen atoms to ionized gas, ultraviolet starlight is thought to have formed such bubbles throughout the early universe, gradually transitioning it from opaque to completely transparent. Background: This composite of archival Hubble Space Telescope visible and near-infrared images includes the three galaxies of EGS77 (green circles).

Credit

Credits: NASA, ESA and V. Tilvi (ASU)

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