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News Link • Space Travel and Exploration

Video: Fly Through A Billion Light Years of the Universe, Past Galaxy Clusters and Dark Matter

•, By Rebecca Boyle
 There are close to 400,000 galaxies in this animation, whose precise locations come from the Sloan Digital Sky Survey. It seems a little overwhelming when you full-screen it, but this is just one tiny slice of the cosmos -- it only goes to about redshift 0.1, an astronomical term for distance that means these stars are 1.3 billion light years away. Or, more accurately, their light left them 1.3 billion years ago.

Flying through galaxy clusters, you start to get a sense for the larger-scale structures that organize these massive clumps of matter into wispy tendrils. This is thought to be the work of dark matter. Astronomers are using SDSS data to track the stuff, and visualizations like this can help.

The latest SDSS data dump includes the first information from the Baryon Oscillation Spectroscopic Survey, or BOSS, which tracks something called baryon acoustic oscillation. What you need to know about that: It's like a cosmic yardstick, helping scientists measure the gravitational influence of dark matter and dark energy, which is thought to be driving the accelerating expansion of the universe. But sometimes, data is just pretty, isn't it?

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