Ancient Galaxy MXDFz4.4 in Fornax Excites Astronomers | Hubble Space Telescope

Ancient Galaxy MXDFz4.4 in Fornax Excites Astronomers | Hubble Space Telescope

Astronomers, using NASA’s Hubble Space Telescope, have observed ultraviolet light escaping from a galaxy that has existed since only 1.4 billion years after the big bang. The galaxy, called MXDFz4.4, appears during a critical period known as the Era of Reionization, when the universe transformed from a dense cosmic fog into the clear cosmos we see today. This finding implies that similar galaxies in the distant, early universe were responsible for clearing the neutral fog of hydrogen gas that once filled the cosmos. 

Credit: NASA's Goddard Space Flight Center 
Paul Morris: Lead Producer
Duration: 1 minute, 44 seconds
Release Date: June 23, 2026

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