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How Long Has The Universe Been Accelerating? (Synopsis) [Starts With A Bang]

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“Even if I stumble on to the absolute truth of any aspect of the universe, I will not realise my luck and instead will spend my life trying to find flaws in this understanding – such is the role of a scientist.” -Brian Schmidt

One of the biggest surprises in our understanding of the Universe came at the end of the 20th century, when we discovered that the Universe wasn’t just expanding, but that the expansion was accelerating. That means the fate of our Universe is a cold, lonely and isolated one, but it’s a fate that we wouldn’t have uncovered if we were born when the Universe was just half it’s current age.

Image credit: NASA & ESA, via http://www.spacetelescope.org/images/opo9919k/.

By understanding the Universe’s expansion history and determining what the different components are that it’s made of, we can figure out exactly how long the Universe has been accelerating. We find that dark energy rose to prominence some 7.8 billion years ago, and the Universe has been accelerating for the last 6 billion years. As the acceleration continues, more and more galaxies become unreachable from our perspective, even at the speed of light; that number’s already up to 97% of the galaxies in our visible Universe.

Image credit: ESA/Hubble & NASA, of galaxy cluster LCDS-0829.

Go get the whole story on the accelerating Universe, and what we’ve missed out on!


Source: http://scienceblogs.com/startswithabang/2016/02/24/how-long-has-the-universe-been-accelerating-synopsis/


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