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Hubble captures a perfectly formed Grand Design Spiral

Georgina Torbet
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An image captured by the Hubble Space Telescope and shared by NASA this week shows the most stunning of spiral galaxies: A Grand Design Spiral called NGC 3631, given that designation because of its clear, prominent arms and highly organized spiral structure. This ideal spiral galaxy is located 53 million light-years from Earth in the constellation of Ursa Major and is seen face-on from Earth to give a perfect view of its pleasing structure.

The image was created using data from two of Hubble’s instruments, the Wide Field Camera 3 and Advanced Camera for Surveys. The Advanced Camera for Surveys is a Hubble camera used primarily for capturing data in the visible light range, which is the same range seen by the human eye. It was installed onto Hubble in 2002. The Wide Field Camera 3 is a newer instrument, installed in 2009 as an upgrade to the older Wide Field and Planetary Camera 2. The Wide Field Camera 3 is used to capture ultraviolet and infrared light as well as to detect visible light.

The Grand Design Spiral, NGC 3631.
This image from NASA’s Hubble Space Telescope features the Grand Design Spiral, NGC 3631, located some 53 million light-years away in the direction of the constellation Ursa Major. The “arms” of grand design spirals appear to wind around and into the galaxy’s nucleus. NASA, ESA, A. Filippenko (University of California - Berkeley), and D. Sand (University of Arizona); Image Processing: G. Kober (NASA Goddard/Catholic University of America)

This image combines both visible light and infrared data. The blue shades represent light which is in the blue visible light wavelength, while the orange represents the infrared data. Looking in the infrared is helpful to look through clouds of dust that are opaque in visible light, and it also maps out the distribution of heat as warm material gives off infrared light.

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This allows Hubble scientists to look at galaxies like NGC 3631 to see regions of dust and regions where new stars are being born.”Close inspection of NGC 3631’s grand spiral arms reveals dark dust lanes and bright star-forming regions along the inner part of the spiral arms,” the Hubble scientists write.

“Star formation in spirals is similar to a traffic jam on the interstate. Like cars on the highway, slower-moving matter in the spiral’s disk creates a bottleneck, concentrating star-forming gas and dust along the inner part of their spiral arms. This traffic jam of matter can get so dense that it gravitationally collapses, creating new stars (here seen in bright blue-white).”

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