Hubble Captures Saturn's Double Light Show (w/ Video)

Feb 16, 2010
This image was originally black and white and recorded only overall brightness. These brightness values were translated into a range of bluish hues. Such color "maps" can be useful in helping to distinguish subtly varying brightness in an image.

(PhysOrg.com) -- In January and March 2009, astronomers using NASA's Hubble Space Telescope took advantage of a rare opportunity to record Saturn when its rings were edge-on, resulting in a unique movie featuring the nearly symmetrical light show at both of the giant planet's poles.

It takes almost thirty years to orbit the Sun, with the opportunity to image both of its poles occurring only twice during that time. The light shows, called aurorae, are produced when electrically charged race along the planet's magnetic field and into the upper atmosphere where they excite atmospheric gases, causing them to glow. Saturn's aurorae resemble the same phenomena that take place at the Earth's poles.

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Credit: NASA, ESA, and J. Nichols (University of Leicester)

The 2009 Hubble Advanced Camera for Surveys data used in this movie have allowed astronomers to monitor the behavior of Saturn's poles in the same shot over a sustained period of time and to analyze the planet's northern and southern lights simultaneously.

The northern auroral oval appears to be slightly smaller and more intense than the southern one, implying that Saturn's is not equally distributed across the planet; it is slightly uneven and stronger in the north than the south.

Besides the double aurora show, a number of Saturn's moons, or satellites, are seen passing the disk of their parent planet.

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