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what is dark energy made of

1 lượt xem 25/10/2020

These galaxy clusters are representative of more than 80 clusters that were used to track the effects of dark energy on these massive objects over time. When combining the information from our map with other cosmological probes, such as the cosmic microwave background—the light left over from the big bang—they all seem to prefer the cosmological constant over more exotic explanations of dark energy. If the ratio of the pressure to the energy density is less than −1/3, a possibility for a component with negative pressure, that component will be gravitationally self-repulsive.

What is dark energy? The remaining portion of the universe consists of ordinary matter and dark matter. and Terms of Use. Space is part of Future US Inc, an international media group and leading digital publisher. How does the observable universe have meaning?

This document is subject to copyright. This discrepancy of 10120 was known even before the discovery of the far weaker dark energy. Thanks to this sort of time-machine, we can measure different distances in space at different cosmic times, helping us work out how quickly the universe is expanding. Dark energy is one of the greatest mysteries in science today.

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We know very little about it, other than it is invisible, it fills the whole universe, and it pushes galaxies away from each other. Your email address is used only to let the recipient know who sent the email. NY 10036.

Most of the matter in galaxy clusters is in the form of very hot gas, which emits copious amounts of X-rays. More is unknown than is known — we know how much there is, and we know some of its properties; other than that, dark energy is a mystery — but an important one. Dark energy, in contrast to both forms of matter, is relatively uniform in time and space and is gravitationally repulsive, not attractive, within the volume it occupies.

Dark energy was discovered in 1998 with this method by two international teams that included American astronomers Adam Riess (the author of this article) and Saul Perlmutter and Australian astronomer Brian Schmidt.

In this paradigm the unexpectedly low value of the constant is understood as a result of an even greater number of opportunities (i.e., universes) for the occurrence of different values of the constant and the random selection of a value small enough to allow for the formation of galaxies (and thus stars and life). The measurement of the expansion rate requires the use of telescopes to measure the distance (or light travel time) of objects seen at different size scales (or redshifts) in the history of the universe. Receive news and offers from our other brands?

part may be reproduced without the written permission. Adam Riess is Thomas J. Barber Professor in Space Studies, Department of Astronomy and Physics, Johns Hopkins University and Distinguished Astronomer, Space Telescope Science Institute.

They want a more fundamental description of its nature.

Dark energy, in contrast to both forms of matter, is relatively uniform in time and space and is gravitationally repulsive, not attractive, within the volume it occupies. This problem is known as the “coincidence problem” or the “fine-tuning problem.” Understanding the nature of dark energy and its many related problems is one of the most formidable challenges in modern physics. According to inflation theory, these irregularities were the "seeds" that became the galaxies.

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