(See description below)

Left-click for full size
Right-click to save as 1024 x 768 wallpaper

The Cone Nebula: Monstrous Star-Forming Pillar of Gas and Dust

Resembling a nightmarish beast rearing its head from a crimson sea, this monstrous object is actually an innocuous pillar of gas and dust. Called the Cone Nebula — so named because, in ground-based images, it has a conical shape — this giant pillar resides in a turbulent star-forming region.

This picture, taken by the newly installed Advanced Camera for Surveys (ACS) aboard NASA's Hubble Space Telescope, shows a 2.5 light-year portion of the nebula. The entire nebula is 7 light-years long. The Cone Nebula resides 2,500 light-years away in the constellation Monoceros.

Radiation from hot, young stars [located to the leftof the image] has slowly eroded the nebula over millions of years. Ultraviolet light heats the edges of the dark cloud, releasing gas into the relatively empty region of surrounding space. There, additional ultraviolet radiation causes the hydrogen gas to glow, which produces the red halo of light seen around the pillar. A similar process occurs on a much smaller scale to gas surrounding a single star, forming the red bow-shaped arc at the lower left of the image. This arc, seen previously with the Hubble telescope, is 65 times larger than the diameter of our solar system. Background stars can be seen peeking through the evaporating tendrils of gas to the left and dust to the right.

Over time, only the densest regions of the Cone will be left. Inside these regions, stars and planets may form.

The Cone Nebula is a cousin of the M16 pillars, which the Hubble telescope imaged in 1995. Monstrous pillars of cold gas, like the Cone and M16, are common in large regions of star birth. Astronomers believe that these pillars are incubators for developing stars. The origin of the Cone nebula remains a mystery.

The Cone nebula is part of the larger nebula NGC 2264.

ACS made this observation on April 2, 2002. The color image is constructed from three separate images taken in blue, near-infrared, and hydrogen-alpha filters.

Source