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The observable matter of the universe is also spread isotropically, meaning that no direction of observation seems different from any other ; each region of the sky has roughly the same content.
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observable and matter
There is considerable speculation as to why the observable universe is apparently composed almost entirely of matter ( as opposed to a mixture of matter and antimatter ), whether there exist other places that are almost entirely composed of antimatter instead, and what sorts of technology might be possible if antimatter could be harnessed.
Almost all matter observable from the Earth seems to be made of matter rather than antimatter.
Over a long period of time, the slightly denser regions of the nearly uniformly distributed matter gravitationally attracted nearby matter and thus grew even denser, forming gas clouds, stars, galaxies, and the other astronomical structures observable today.
They have been measured in detail, and match what would be expected if small thermal variations, generated by quantum fluctuations of matter in a very tiny space, had expanded to the size of the observable universe we see today.
According to observations of structures larger than solar systems, as well as Big Bang cosmology interpreted under the Friedmann equations and the FLRW metric, dark matter accounts for 23 % of the mass-energy content of the observable universe.
In comparison, ordinary matter accounts for only 4. 6 % of the mass-energy content of the observable universe, with the remainder being attributable to dark energy.
* The majority of mass in galaxies is made up of dark matter, a substance which is not directly observable, and does not interact through any means except gravity.
The behavior of matter and energy throughout the observable universe appears to follow well-defined physical laws.
The observable matter is spread homogeneously ( uniformly ) throughout the universe, when averaged over distances longer than 300 million light-years.
A bubble macroscopically large enough to enclose a ship 200 meters across would require a total amount of exotic matter equal to 10 billion times the mass of the observable universe.
An optical phenomenon is any observable event that results from the interaction of light and matter.
In a closed universe lacking the repulsive effect of dark energy, gravity eventually stops the expansion of the universe, after which it starts to contract until all matter in the observable universe collapses to a point, a final singularity termed the Big Crunch, by analogy with Big Bang.
Moreover, the classical theory of electromagnetic radiation is somewhat limited in its ability to provide correct descriptions, since quantum effects are observable in more everyday circumstances than quantum effects of matter.
While vitalist ideas have been commonplace in traditional medicine, attempts to construct workable scientific models date from the 17th century, when it was argued that matter existed in two radically different forms, observable by their behavior with regard to heat.
A unilateral central lesion ( e. g., a stroke ), no matter how large, is unlikely to produce any observable deficit.
In Big Bang cosmology, the observable universe consists of the galaxies and other matter that humans can, in principle, observe from Earth in the present day — because light ( or other signals ) from those objects has had time to reach the Earth since the beginning of the cosmological expansion.
Whether a term is observable or not is an epistemic matter, because it involves how we can come to know about it.
This raises some concerns, dating back as far as Eugene Wigner's 1960 observations on the matter, that what we call foundations of mathematics and cosmology may be not observable or discoverable absolutes, but rather, aspects of humanity and its cognition.
If God is not literally made up of physical matter, and does not have an observable effect on the world, making a statement about God is not a matter of fact.
As a philosopher, Fechner wanted to develop a method that could relate matter to the mind, connecting the publicly observable world and a person's privately experienced impression of it.
observable and universe
As a direct consequence of this expansion, all of the observable universe originated in a small causally connected region.
However, on scales comparable to the radius of the observable universe, we see systematic changes with distance from the Earth.
The motion of the solar system, and the orientation of the plane of the are aligned with features of the microwave sky, which on conventional thinking are caused by structure at the edge of the observable universe
In cosmology, cosmic microwave background ( CMB ) radiation ( also CMBR, CBR, MBR, and relic radiation ) is thermal radiation filling the observable universe almost uniformly.
This hypothesis relies on the vast size and consistent physical laws of the observable universe.
If confirmed, this would imply special relativity is an approximation to a more general theory, but since the relevant comparison would ( by definition ) be outside the observable universe, it is difficult to imagine ( much less construct ) experiments to test this hypothesis.
* The observable universe is currently believed to have at least 80 billion galaxies.
" since a sufficiently advanced civilization could potentially be observable over a significant fraction of the size of the observable universe.
The observable ( i. e. past light cone ) universe contains 6 cubic inches (< sup > 4 </ sup >/< sub > 3 </ sub > × π × ( 14 light years in inches )< sup > 3 </ sup >).
In fact there are only about 2. 5 elementary particles in the observable universe, so even if one were to use an elementary particle to represent each digit, one would run out of particles well before reaching a googol of digits.
The observable universe is estimated to be 8. 80 meters, or 93 billion light-years, in diameter, so the distance required to write the necessary zeroes is 4. 0 times as long as the estimated universe.
There are only about 3 cubic metres in the observable universe, giving about 7. 1 Planck spaces in the entire observable universe, so a googolplex is far larger than even the number of the smallest measurable spaces in the observable universe.
observable and is
As a general rule, the higher tablelands lie to the east and south, while a progressive diminution in altitude towards the west and north is observable.
Abstractions may be formed by reducing the information content of a concept or an observable phenomenon, typically to retain only information which is relevant for a particular purpose.
In other words, it is quite possible that actual existence may be ... an efficient cause of observable effects ...." He then launches into a history of attempts to conceptualize the inconceivable from the ancient Greeks to the present.
Self-adjoint operators, where A = A < sup >†</ sup >, play an important role in quantum mechanics ; for example, an observable is always described by a self-adjoint operator.
This means that there is no observable difference between the gravitational field of such a black hole and that of any other spherical object of the same mass.
If a state is not observable, the controller will never be able to determine the behaviour of an unobservable state and hence cannot use it to stabilize the system.
That is, if one of the eigenvalues of the system is not both controllable and observable, this part of the dynamics will remain untouched in the closed-loop system.
There is a common interest in the processes ( often of a linguistic or symbolic kind ) that give rise to observable phenomena and here there is some mutual influence among the different versions of critical theory.
A corona is a type of plasma " atmosphere " of the Sun or other celestial body, extending millions of kilometers into space, most easily seen during a total solar eclipse, but also observable in a coronagraph.
The F-corona ( F for Fraunhofer ) is created by sunlight bouncing off dust particles, and is observable because its light contains the Fraunhofer absorption lines that are seen in raw sunlight ; the F-corona extends to very high elongation angles from the Sun, where it is called the zodiacal light.
In addition, if the particles of which it is composed are supersymmetric, they can undergo annihilation interactions with themselves resulting in observable by-products such as photons and neutrinos (" indirect detection ").
The Deccan Traps region was reduced to its current size by erosion and plate tectonics ; the present area of directly observable lava flows is around.
An observable a is a function that to each point of the phase space associates a number ( say instantaneous pressure, or average height ).
In scientific use the term empirical refers to the gathering of data using only evidence that is observable by the senses or in some cases using calibrated scientific instruments.
What early philosophers described as empiricist and empirical research have in common is the dependence on observable data to formulate and test theories and come to conclusions.
This phenomenon is easily observable when comparing skimmed milk, which contains little fat, to cream, which contains a much higher concentration of milk fat.
The concept first popularized by Karl Popper, who, in his philosophical criticism of the popular positivist view of the scientific method, concluded that a hypothesis, proposition, or theory talks about the observable only if it is falsifiable.
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