Headlines > News > Picture of the Day - The Helix Nebula

Picture of the Day - The Helix Nebula

Published by Matt on Thu Jan 7, 2010 6:34 pm via: Hubble ESA
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Planetary nebulae like the Helix are sculpted late in a Sun-like star’s life by a torrential gush of gases escaping from the dying star.  They have nothing to do with planet formation, but got their name because they look like planetary disks when viewed through a small telescope.

The Helix Nebula. Credit: ESA/NASA

The Helix Nebula. Credit: ESA/NASA

The composite picture is a seamless blend of ultra-sharp Hubble Space Telescope images combined with the wide view of the Mosaic Camera on the National Science Foundation’s 0.9-meter telescope at Kitt Peak National Observatory.

Astronomers at the Space Telescope Science Institute assembled these images into a mosaic. The mosaic was then blended with a wider photograph taken by the Mosaic Camera. The image shows a fine web of filamentary “bicycle-spoke” features embedded in the colorful red and blue gas ring, which is one of the nearest planetary nebulae to Earth.

Because the nebula is nearby, it appears as nearly one-half the diameter of the full Moon. This required HST astronomers to take several exposures with the Advanced Camera for Surveys to capture most of the Helix. HST views were then blended with a wider photo taken by the Mosaic Camera. The portrait offers a dizzying look down what is actually a trillion-mile-long tunnel of glowing gases. The fluorescing tube is pointed nearly directly at Earth, so it looks more like a bubble than a cylinder. A forest of thousands of comet-like filaments, embedded along the inner rim of the nebula, points back toward the central star, which is a small, super-hot white dwarf.

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