a: dark energy ~
b: accelerator

What:

"Dark matter is like the "brake," acting to slow down the initial expansion, and it dominated the expansion rate for the first 8 billion years. Dark energy is like the "accelerator," acting to speed up the expansion, and as the dark matter has been diluted dark energy has come to dominate the expension rate for the past 5 billion years, and it will continue to do so in the future."


Useful?
Writer: Chris Impey
LCC:
Where:
Date: Sep 6 2016 5:03 PM


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