Credit: NASA/JPL-Caltech/IPAC

These ghostly pillars span a large swath of sky about half the width of your outstretched hand held at arm’s length, falling along the boundary between the constellations of Vela and Centaurus. However, they have no common name and are not identified in historic catalogs like Messier or NGC for the simple reason they cannot be seen in visible light. This region falls behind a veil of dust in the spaces between stars and can only be seen at longer wavelengths of infrared light, as seen here in data from NASA’s WISE mission. At wavelengths of 12 and 22 microns, displayed here in green and red, respectively, the obscuring dust becomes more transparent, and denser clouds of dust begin to glow clearly under the light of neighboring stars.

Pillars such as these are found in regions where there are clumpy, denser clouds of gas and dust falling under the illumination of nearby hot, bright stars. The dust particles are slowly destroyed by the stars’ ultraviolet light, but denser regions erode more slowly than their surroundings, and even shield material behind them. This creates striking pillar-shaped structures like these.

The tips of these pillars often serve as stellar nurseries, as the denser gas and dust collapse over time to form and nurture new stars. These can be seen as red-tinted spots of light in the two largest pillars in this image, glowing brightly at the longest wavelengths of infrared light.

This image uses data from the original cryogenic phase of the WISE mission. Infrared wavelengths of 3.4 & 4.6 microns are displayed in blue and cyan, respectively, and are dominated by the glow of stars. Light with a wavelength of 12 microns is displayed in green and traces the presence of carbon-rich dust known as polycyclic aromatic hydrocarbons (PAHs). The 22 micron light is rendered in red and is dominated by the thermal glow of warm dust.

Provider: Wide-field Infrared Survey Explorer

Image Source: /image/wise/WISE2024-06

Curator: Wide-field Infrared Survey Explorer