How Does Dark Energy Stretch Our Universe?

Scientists have just mapped 1.2 million galaxies! Here's how can this 3D map can be used to learn about dark energy and dark matter.
Could Galactic Walls Prove We're Wrong About The Universe? -
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BOSS Makes The Most Precise Measurement Yet Of The Universe's Expansion
"The Baryon Oscillation Spectroscopic Survey data has helped astronomers learn how fast the universe was expanding just 3 billion years after the Big Bang."
Dark Energy, Dark Matter
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"In the early 1990s, one thing was fairly certain about the expansion of the Universe. It might have enough energy density to stop its expansion and recollapse, it might have so little energy density that it would never stop expanding, but gravity was certain to slow the expansion as time went on."
Baryon Acoustic Oscillations
"My group uses this acoustic peak to measure the cosmic distance scale and thereby probe the acceleration of the expansion history of the Universe and the properties of dark energy. The acceleration causes higher redshift objects to appear more distant. We can measure distance by determining the angle subtended by something of known size; in this case, we are using the peak in galaxy correlations at 150 Mpc as the feature of known size."
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