Dark energy, mysterious as it sounds, has become part of the furniture in cosmology. This suggested that our (at the time) accepted models for the expansion of the Universe were incorrect. The Universe is vast and ever expanding.

As far as cosmologists can tell, the mysterious force behind the accelerated expansion of the universe, a force that we call dark energy, remains constant. The deep mystery enshrouding this anti-gravity effect is perhaps the biggest puzzle of modern physics, with little consensus over where dark energy comes from, … A. neither gravity nor dark energy is enough to overcome the expansion B. gravity is not large enough to stop the expansion C. gravity is greater than the force of expansion C 1. closed universe B 2. open universe A 3. empty universe Answer Key: 1:C, 2:B, 3:A The expansion of the Universe is accelerating. But it may not have done so in the past. Scientists explain this by conjecturing that dark energy must exist. That was the year astronomers first discovered that the expansion of the universe has been speeding up over time, with dark energy acting as the accelerator. Dark energy, one of the great unsolved mysteries of cosmology, may cause its accelerating expansion. Dark energy is a mysterious quantity that makes up, along with dark matter, most of the mass of the universe. This implied the expansion rate of the universe is faster now than it was in the past, a result of the current dominance of dark energy. Using NASA's Hubble Space Telescope, researchers measured the expansion of the universe … Dark energy is a mysterious force making the universe fly apart faster and faster. Dark energy is now thought to make up 68% of everything in the universe. The evidence that this repulsive energy infuses space has stacked up since 1998. Type Ia supernovas that exploded when the universe was only two-thirds of its present size were fainter and thus farther away than they would be in a universe without dark energy. The first observational evidence for its existence came from supernovae measurements, which showed that the universe does not expand at a constant rate; rather, the expansion of the universe is accelerating. "However, there is no understanding of what dark energy is or why it … There's too much matter-and-energy for the initial expansion rate, and the Universe expands to a maximum size and then contracts, eventually collapsing in a Big Crunch. We know that there is some matter in the universe (we live on a giant ball of matter called the Earth, after all), but our measurements of the luminous and dark matter in the Universe have shown that there is not enough matter to close the universe, or even to make it flat (that is ρ ave < ρ crit). If dark energy were to drive a galloping kind of expansion, the universe itself might one day be torn apart in a Big Rip. It turns out that roughly 68% of the universe is dark energy. "The accelerated expansion of the universe has been attributed to the effects of dark energy," Kipreos said. That is, there is essentially no “Dark Energy,” but there is a manifestation of the boundaries of the Universe. As far as we know it is limitless so that amount of energy would not change anything. In principle, there is no reason that the expansion of the universe must be monotonic and there are models where at some time in the future the scale factor decreases with an attendant contraction of space rather than an expansion. Other than that, it is a complete mystery. But it is an important mystery. Only this leads, on the contrary, to additional repulsion, which accelerates the expansion of the Universe. Dark energy is an enigmatic phenomenon that acts in opposition to gravity and is responsible for accelerating the expansion of the universe. Though dark energy … Dark matter makes up about 27%. E. Siegel / Beyond The … Scientists now have evidence that dark energy has been around for most of the universe's history. We know how much dark energy there is because we know how it affects the universe's expansion.

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