Photo: NASA's Hubble spies superbubble scene

NASA's Hubble Space Telescope captured an expansive cosmic scene within the Large Magellanic Cloud (LMC), a satellite galaxy of the Milky Way. This region, known as LHA 120-N44 or N44, is located in the Dorado constellation and presents a striking nebula named LHA 120-N44, or N44, within its boundaries. The nebula's defining characteristics are a vast central void and a shell of dense, dusty gas.

This "superbubble" spans roughly 210 by 140 light-years in diameter. Its formation occurred through the action of powerful stellar winds and explosive supernovae from the central star cluster. The expulsion of gas by these stellar forces led to the compression of gas, which subsequently coalesced to form the surrounding shell. New stars continue to emerge within this compressed gas shell, making N44 a particularly intriguing target for astronomers.

Their objective is to comprehend the timeline from the collapse of cold gas clouds into dense knots to the ignition of nuclear fusion in the cores of newborn stars. The data presented in the image were obtained from an observing program (number 14689, principal investigator: Gouliermis) that utilized Hubble to survey N44 and catalog its stars.

Approximately half a million stars were identified within the cluster, along with nearly 30,000 pre-main-sequence stars - those that have not yet begun fusing hydrogen into helium in their cores. This abundance of young stars was made possible by Hubble's high sensitivity and fine spatial resolution, enabling the detection of faint objects even within crowded clusters.

The gas shell surrounding the superbubble is illuminated by the ultraviolet radiation emitted by massive stars, causing it to glow and accentuating several distinct features. These features were originally cataloged by astronomer Karl Henize in the 1950s. One of these features is a smaller bubble, cataloged as N44F, situated in the upper-right corner of the image.

N44F is an interstellar bubble shaped by the intense stellar winds of a single, hot, massive star. Its vigorous winds and radiation have sculpted the surrounding bubble, creating pillars of dusty gas. Hubble's observations of the lowest-mass stars in this region offer a new perspective on star formation within environments that are resource-poor in elements heavier than helium, much like the LMC or galaxies from the early universe.