Witness The Birth Of Stars Through Hubble's Eyes

This NASA/ESA Hubble Space Telescope image showcases a stunning collection of interstellar gas and dust. Known as RCW 7, the nebula lies over 5,300 light-years from Earth in the constellation Puppis.

Nebulae are regions rich in the raw materials needed to form new stars. Gravity causes parts of these molecular clouds to collapse, forming very young stars called protostars. These protostars are still surrounded by spinning discs of leftover gas and dust.

Image Courtesy: NASA

The protostars in RCW 7 are particularly massive. They emit strongly ionizing radiation and fierce stellar winds, transforming the nebula into an H II region. H II regions are filled with hydrogen ions. H I refers to a normal hydrogen atom, while H II is hydrogen that has lost its electron, making it an ion.

Ultraviolet radiation from these massive protostars excites the hydrogen in the nebula. This causes it to emit light, giving the nebula its soft pinkish glow. The Hubble data in this image came from studying a particularly massive protostellar binary named IRAS 07299-1651.

Observing Protostars

IRAS 07299-1651 is still in its glowing cocoon of gas within the curling clouds toward the top of the image. To reveal this star and its siblings, astronomers used Hubble's Wide Field Camera 3 in near-infrared light. Massive protostars in this image are brightest in ultraviolet light but also emit plenty of infrared light.

Infrared light's longer wavelength allows it to pass through much of the gas and dust in the cloud, enabling Hubble to capture it. Many larger-looking stars in this image are foreground stars not part of the nebula; they lie between the nebula and our solar system.

The Lifecycle of RCW 7

The creation of an H II region signals the beginning of the end for a molecular cloud like RCW 7. Within a few million years, radiation and winds from massive stars will gradually disperse the nebula's gas. This process accelerates as the most massive stars end their lives in supernova explosions.

New stars within this nebula will incorporate only a fraction of its gas. The remaining gas will spread throughout the galaxy, eventually forming new molecular clouds.

This image provides a glimpse into the dynamic processes shaping our universe. It highlights how massive stars influence their surroundings and contribute to ongoing star formation across galaxies.