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Astronomers using NASA's Hubble Space Telescope discovered a cosmic object called Cloud-9, described as a failed galaxy located 14 million light-years from Earth. The object is a cloud of dark matter that contains no stars, marking the first confirmed detection of such an object.

Astronomers using NASA's Hubble Space Telescope discovered a cosmic object called Cloud-9, described as a failed galaxy located 14 million light-years from Earth. The object is a cloud of dark matter that contains no stars, marking the first confirmed detection of such an object.

Cloud-9 is scientifically known as a Reionization-Limited H I Cloud, or RELHIC, where H I refers to neutral hydrogen. Scientists believe it represents a primordial building block of a galaxy that never fully formed stars, preserving conditions from the universe's earliest eras.

Cloud-9 is scientifically known as a Reionization-Limited H I Cloud, or RELHIC, where H I refers to neutral hydrogen. Scientists believe it represents a primordial building block of a galaxy that never fully formed stars, preserving conditions from the universe's earliest eras.

The object's core consists of neutral hydrogen spanning approximately 4,900 light-years across, with gas mass estimated at roughly one million times that of the Sun. Calculations indicate the entire structure contains approximately five billion solar masses of dark matter.

The object's core consists of neutral hydrogen spanning approximately 4,900 light-years across, with gas mass estimated at roughly one million times that of the Sun. Calculations indicate the entire structure contains approximately five billion solar masses of dark matter.

Cloud-9 was first identified in 2023 during a radio survey by China's Five-hundred-meter Aperture Spherical Telescope, with follow-up observations from the Green Bank Telescope and Very Large Array. Hubble's Advanced Camera for Surveys confirmed the absence of stars within the cloud.

STScI

Cloud-9 was first identified in 2023 during a radio survey by China's Five-hundred-meter Aperture Spherical Telescope, with follow-up observations from the Green Bank Telescope and Very Large Array. Hubble's Advanced Camera for Surveys confirmed the absence of stars within the cloud.

The discovery provides scientists a rare opportunity to study a dark matter-dominated cloud without light interference from stars. Andrew Fox noted that Cloud-9 serves as "a window into the dark universe," helping researchers understand the invisible material comprising most cosmic mass.

The discovery provides scientists a rare opportunity to study a dark matter-dominated cloud without light interference from stars. Andrew Fox noted that Cloud-9 serves as "a window into the dark universe," helping researchers understand the invisible material comprising most cosmic mass.

Cloud-9 appears physically associated with the nearby spiral galaxy Messier 94, with high-resolution radio data suggesting subtle gravitational interaction. The object exists in a narrow mass range where it can persist without collapsing to form stars or dispersing its gas entirely.

Cloud-9 appears physically associated with the nearby spiral galaxy Messier 94, with high-resolution radio data suggesting subtle gravitational interaction. The object exists in a narrow mass range where it can persist without collapsing to form stars or dispersing its gas entirely.

Hubble Discovers First Starless 'Failed Galaxy' Cloud-9

Hubble Discovers First Starless 'Failed Galaxy' Cloud-9

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Hubble Discovers First Starless 'Failed Galaxy' Cloud-9

Hubble Discovers First Starless 'Failed Galaxy' Cloud-9

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