Observable universe
See universe for a general discussion of the universe.
VLT finds galaxy cluster at the edge of the observable Universe
The sky region of the galaxies at a distance of about 13.5 billion light-years from the Earth.
Extending the edge of the observable Universe
DR EMILY BALDWIN
ASTRONOMY NOW
Posted: 26 May 2011 ...
Observable Universe
The extent of the Universe that we can see with the aid of the largest telescopes. Its ultimate boundary is determined by the horizon size.
Observational Cosmology ...
observable universe: The part of the universe that is visible from Earth's location in space and in time.
occultation: The passage of a larger body in front of a smaller body.
observable universe
The part of the universe that we can see from our location in space and in time.
Olbers' paradox ...
Observable Universe
The portion of the entire universe that can be seen from Earth.
Observation ...
Observable universe
In Big Bang cosmology, the observable universe consists of the galaxies and other matter that we can in principle observe from Earth in the present day, ...
All of the observable universe is filled with large numbers of photons, the so-called cosmic background radiation, and quite likely a correspondingly large number of neutrinos. The current temperature of this radiation is about 3 K (âˆ'270.
* Note: The observable Universe may be only a small part of the physical Universe. In some theories, the Universe may have expanded very fast just after the 'big bang', and only a little bit may have remained within range of detection.
Isotropy of observable universe
Proponents of big bang also cite isotropy of the observable universe to one part in one hundred thousand as evidence that big bang is valid[1].
In a big bang with only the matter and radiation known in the Standard Model, two widely separated regions of the observable universe cannot have equilibrated because they move apart from each other faster than the speed of light - thus have never ...
Most of the observable Universe consists of particles and matter, as opposed to antiparticles and antimatter. [Silk90] ...
Their redshift indicates that they, too, are extragalactic and occur towards to edge of the observable universe.
In Chapter 2 we introduced the first "rung" on a ladder of distance-measurement techniques that will ultimately carry us to the edge of the observable universe. That rung is radar ranging on the inner planets.
The most distant galaxies known, near the edge of the observable universe, are faint blue objects called "blue fuzzies" because of their appearance on photographic plates.
Astronomers often talk about "the observable Universe" which is essentially what we can see - the solar system, local stars a few light years/parsecs away, ...
As dramatic as is the change in scale from Solar System distances to interstellar distances, an equally dramatic change in scale is found when we go from the scale of our Galaxy to the limits of the observable universe.
According to observations of structures larger than galaxies, as well as Big Bang cosmology interpreted under the Friedmann equations and the FLRW metric, dark matter accounts for 23% of the mass-energy density of the observable universe.
LARGE-SCALE STRUCTURE - Structures composed of galaxy superclusters, galactic sheets, filaments and voids that span significant fractions of the observable Universe.
If you start with your hometown and zoom out nine times, you reach the edge of the observable universe. This diagram is a simple example of a logarithmic scale.
There are billions of galaxies in the observable universe. Exactly when and how galaxies formed in the Universe is a topic of current astronomical research.
Galaxies are found in a variety of sizes and shapes.
A theoretical model of the "birth" of the observable universe, which suggests that the universe began as a rapid expansion of space and time from a single point, or singularity.
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After enough time, all galaxies beyond our Local Group will have disappeared beyond the edge of the observable universe**. After a longer time, all the stars in all the galaxies will have died, and there will be nothing left to make new ones.
Matter is a material substance that constitutes the observable universe and, together with energy, forms the basis of all objective phenomena.
A broadly accepted theory for the origin and evolution of our universe. The theory says that the observable universe started roughly 13.7 billion years ago from an extremely dense and incredibly hot initial state.
Binary Star System ...
In a skeptical vein, Kennicutt (in The Interstellar Medium in Galaxies, Kluwer, 1990) points out that the same CO-FIR relation is also followed by a burning cigar, his Jeep, the Yellowstone forest fire, and the observable Universe.
Our Sun is a member of the Milky Way Galaxy. There are billions of galaxies in the observable universe. Exactly when and how galaxies formed in the Universe is a topic of current astronomical research.
The film starts with a man and woman in a city park and then expands the field of view by ten times every ten seconds until it reaches the bounds of the observable universe.
Our Sun is a member of the Milky Way Galaxy, which is sometimes just designated by capitalization: Galaxy. There are billions of galaxies in the observable universe.
This is close to the edge of the observable universe and its light has taken since nearly the beginning of the universe to reach us. Protogalaxies provide us with a look at the era when galaxies were first coming to life.
The observable universe is the Universe that reveals itself through electromagnetic radiation that can be detected on Earth. And because that radiation travels at a finite speed we actually look back in time when we look into the cosmos.
 See also: Universe, Light, Time, Earth, Galaxies
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