Hubble Reveals a Giant Stellar Superbubble in N44

Hubble’s September 3, 2026 image of N44 captures stellar feedback in action. At the center is an enormous cavity cleared by massive stars; around it is a glowing, dense shell of gas and dust. Together, those structures show how energetic stars can both disperse their birth cloud and reshape nearby material into places where later generations of stars may form. 217

Where N44 is located

N44—also called LHA 120-N44—is a star-forming emission nebula in the Large Magellanic Cloud, a neighboring galaxy of the Milky Way. It lies in the constellation Dorado, roughly 160,000 light-years from Earth. 17

The image’s most conspicuous feature is its central superbubble, a vast void measuring about 210 by 140 light-years. 217

What made the superbubble

The bright stars within the central cavity are responsible for excavating it. Their powerful stellar winds, followed by supernova explosions, pushed away much of the gas from which they formed. 2

That displaced material did not simply vanish. It accumulated around the cavity as a shell of dense, dusty gas. Ultraviolet radiation from massive stars energizes this shell, causing it to glow in Hubble’s view. 17

In other words, N44 records two linked effects of massive stars:

• Clearing: winds and supernovae remove and disturb gas near the stellar cluster.
• Compression: swept-up material can collect in a dense shell, creating conditions associated with subsequent star formation. 217

A stellar nursery shaped by stellar destruction

N44 is compelling because its apparent destruction and creation are part of the same process. The central cluster’s radiation, winds, and explosions radically alter the nebula, but the resulting shell is not inert debris. Its compressed gas is part of the active star-forming environment surrounding the superbubble. 17

This makes regions like N44 valuable for studying stellar feedback: the way young, massive stars influence the clouds that produced them and the material from which later stars can emerge.

What Hubble program 14689 found

The image data came from Hubble observing program 14689, led by principal investigator D. Gouliermis. The survey took a census of N44’s stellar population, cataloging nearly half a million stars in the cluster and unrelated foreground objects along the same line of sight. 1

Nearly 30,000 cataloged objects are pre-main-sequence stars—young stars that have not yet started fusing hydrogen into helium in their cores. 1

Finding that population is a major advantage of Hubble’s sensitivity and spatial resolution. In a crowded stellar region, faint young stars can be difficult to separate from neighboring sources; Hubble was able to identify them in large numbers. 1

The resulting census gives astronomers a rich population with which to investigate the stages of stellar birth, from very young objects to stars approaching the main sequence. It also places N44’s striking superbubble within a broader, measurable stellar ecosystem rather than treating it as only a photogenic cavity.

A smaller bubble inside the broader complex

N44 also contains the smaller interstellar bubble N44F. An earlier Hubble close-up showed N44F as a gas cavity sculpted by the stellar wind and intense ultraviolet radiation of a young hot star. 27

That smaller example helps put the new wide view in perspective: N44 is not shaped by a single mechanism or scale. Individual massive stars can carve local bubbles, while groups of massive stars and supernovae can produce the much larger superbubble at the heart of the complex.

Hubble’s new N44 image therefore offers more than a dramatic scene. It is a snapshot of a continuing cycle in which massive stars clear gas, illuminate and compress the surrounding nebula, and help set the conditions for the next generation of stars. 1217