Presentation on theme: "Hiromi Suenaga Cody Tamura Period 1. It affects the Universe’s expansion Other than that it is a total mystery Roughly 70 % of the universe is dark."— Presentation transcript:
It affects the Universe’s expansion Other than that it is a total mystery Roughly 70 % of the universe is dark energy
It could be a property of space Albert Einstein was the first person to realize empty space is not really empty
One of his Gravity Theories that uses a cosmological constant makes a prediction that “empty space” can possess its own energy
As more space comes into existence, more dark energy would appear This would accelerate the expansion of the Universe No one really understands why the cosmological constant is there
Another theory utilizes the quantum theory of matter Empty space is comprised of “virtual” particles that form and disappear continuously Unfortunately, physicists tried to calculate the energy empty space would have, but was the solution was 10^120 times too large
Another theory is that dark energy could be a new kind of dynamical energy fluid or field Another theory is that Einstein’s theory is incorrect Dark energy would not only affect the expansion of the Universe, but would also affect normal matter in galaxies as well.
Before the dark energy was first observed, there were two models of the fate of the Universe
The Big Crunch theorizes that the Universe’s expansion would slow down until it finally begins to retract Essentially, it would be the opposite of the Big Bang
The Big Chill theorizes that the Universe would expand at a decelerating rate Galaxies would drift extremely far apart from each other All stars would die out and the Universe would be vast, cold, and dark
With dark energy, the Universe’s expansion would accelerate until clusters of galaxies would tear apart Galaxies would tear apart, until molecules and atoms would rip apart It would be a more violent expansion than the Big Bang
The Chandra X-ray Observatory has found evidence that the Big Rip is not in the Universe’s future Observations have shown an increase in mass in galaxy clusters An increase in mass or growth would be difficult with dark energy Observations strengthen the idea that dark energy is the cosmological constant in Einstein’s theory
Atkinson, Nancy. "No “Big Rip” in Our Future: Chandra Provides Insights Into Dark Energy." Universe Today. 16 Dec. 2008. Web. 17 Apr. 2011.. "Dark Energy." Large Synoptic Survey Telescope. Web. 17 Apr. 2011.. "Dark Energy, Dark Matter." NASA Science. Web. 17 Apr. 2011.. "HubbleSite - Dark Energy - Fate of the Universe." HubbleSite - Out of the Ordinary...out of This World. Web. 17 Apr. 2011.. Moskowitz, Clara. "What Is Dark Energy? | Space.com." Space, NASA Information & News | Outer Space Flight Videos & Pictures | Astronomy, Solar System Images | Space.com. Web. 17 Apr. 2011..