Background radiation
Background radiation is the ionizing radiation emitted from a variety of natural and artificial radiation sources: sources in the Earth and from those sources that are incorporated in our food and water, ...
The cosmic microwave background radiation and the cosmological red shift are together regarded as the best available evidence for the Big Bang (BB) theory.
Timeline of other background radiation fields
Timeline of other background radiation fields ...
annoying background noise using a special low noise antenna. The strange thing about the noise was that it was coming from every direction and did not seem to vary in intensity at all. They had discovered the Cosmic Microwave Background Radiation.
cosmic background radiation; primal glow
The background of radiation mostly in the frequency range 3 × 108 to 3 × 1011 Hz (see scientific notation) discovered in space in 1965.
Cosmic Background Radiation
The nearly uniform radiation received from all regions of the sky. It is a radio signal with a temperature of 2.7K, and is thought to be the cooled afterglow of the Big Bang.
Cosmic Background Radiation (CBR) - Radiation observed to have almost perfectly uniform brightness in all directions in the sky. The CBR is highly redshifted radiation produced about a million years after the universe began to expand ...
BACKGROUND RADIATION
Background radiation is the microwaves permeating the universe that are probably the remnants of the . This background radiation accounts for a temperature of 2.7 K in space.
This background radiation is the remnant of the light that first travelled the universe a few hundred thousand years after the Big Bang.
Cosmic Background Radiation: The remnant radiation from the Big Bang. Its distribution in the universe today can tell us about how the universe may have formed.
Cosmonaut: A participant in the Russian human spaceflight programme.
D ...
cosmic background radiation - The microwave radiation coming from all directions that is believed to be the redshifted glow of the big bang.
Cosmic Background Radiation: The blackbody radiation, now mostly in the microwave band, which consists of relic photons left over from the very hot, early phase of the Big Bang.
COSMIC BACKGROUND RADIATION
Cosmic Background Radiation (abbreviated CMB, CMBR and CBR) is the radiation (energy) which remains from the original Big Bang explosion which formed the universe.
Microwave background radiation- the radiation from the glowing of the hot early universe, now so greatly red-shifted that it appears not as light but as microwaves (radio waves with a wavelength of a few centimeters) ...
background radiation (Plasma Physics and Fusion Energy Glossary) Level of environmental radation due to Level of environmental radation due to "background" sources.
The presence of a background radiation which has a temperature, spectrum and uniformity consistent with Big Bang cosmology and inflation, is extremely difficult to produce by any other means.
COSMIC INFRARED BACKGROUND RADIATION (CIBR) - Radiation predicted to account for the energy from production of metals in the nearby universe.
Mapping the Cosmic Background Radiation
Perhaps the most spectacular discovery of all was a faint "hiss" of radio signals coming equally from all directions in the universe.
Cosmic Microwave Background Radiation
In 1965, a great discovery was made. Microwave radiation was detected from all directions in the sky. Later on, scientists realized that the origin of this radiation is cosmological.
Cosmic Microwave Background Radiation: Radiation left over from the Big Bang. Because of the expansion of the Universe, the radiation is detected in the microwave portion of the spectrum, and has a temperature of only 2.7 K.
cosmic microwave background radiation: Radiation from the hot clouds of the big bang explosion. Because of its large red shift, it appears to come from a body whose temperature is only 2.7 K.
In particular, we detect the same intensity of cosmic radio waves (cosmic background radiation) from all directions of space, suggesting that the regions that emitted that radiation had the same temperature at the time of emission.
The COBE satellite carried instrumentation aboard that allowed it to measure small fluctuations in intensity of the background radiation, ...
Calculations show that before decoupling (which occurred at a redshift of 1500), the intense background radiation would have prevented clumps of normal matter from contracting.
The Big Bang theory suggests the existence of neutrino and gravitational background radiations as well, though the means to detect such do not yet exist. [F88] ...
Detailed analysis of the microwave background radiation gives practically our only direct evidence of conditions before galaxy formation.
An independent way to measure the overall geometry of the universe is to look at the fluctuations in the cosmic microwave background radiation.
It is thought that the cosmic background radiation left over from the Big Bang includes a background of low energy neutrinos. In the 1980s it was proposed that these may be the explanation for the dark matter thought to exist in the universe.
In 1975, infrared observations made from a balloon flight proved that the Cosmic Background Radiation follows a blackbody curve. Additional studies of the Cosmic Background Radiation were done using the COBE satellite which was launched in 1989.
SAS-2 and COS-B confirmed the earlier findings of gamma-ray background radiation and also detected a number of point sources, ...
Neutrinos are produced as a result of natural background radiation. In particular, the decay chains of uranium-238 and thorium-232 isotopes, as well as potassium-40, include beta decays which emit anti-neutrinos.
The 3 K radiation is called various things, like the Cosmic Background Radiation, the Cosmic Microwave Background Radiation, the 3 K background radiation or all other sorts of variations of these words.
"The constraints on the density of baryonic [normal] matter from nucleosynthesis and the cosmic microwave background radiation tells us that if MACHOs exist they have to be non-baryonic," says Green.
In physical cosmology, the cosmic microwave background radiation CMB is a form of electromagnetic radiation filling the universe. With a traditional optical telescope, the space between stars and galaxies is pitch black....
.
This theory received a boost in 1965 when radiation at 3 degrees K, the microwave background radiation, was discovered coming from all directions in space.
The background radiation, representing light stretched into the microwave region, is truly omnidirectional and floods the entire sky. However, it stands at a temperature of 2.
In addition to the diffuse background radiation, numerous discrete sources of radio emission exist in the Galaxy. These discrete sources include the following: supernova remnants, radio stars, emission nebulas, molecular clouds, and pulsars.
the form of gamma rays at the time of the big bang, but has since cooled so that today its temperature is 3 K and its peak wavelength is near 1.1 millimeters (in the microwave portion of the spectrum). Also known as the 3-degree background radiation.
Image to right: This is a COBE image of the cosmic microwave background radiation. The pink and blue colors show tiny fluctuations in the temperature of the radiation. Credit: NASA ...
In 1965 Robert Dicke of Princetown University was investigating the theory of Big Bang and was pursuing the idea that a residue of the big bang would take the form of low level background radiation that should still be detectable today.
Recent observations (such as the BOOMERANG and MAXIMA cosmic microwave background radiation results, and various supernova observations) imply that the expansion of the Universe is accelerating.
The premise that there is no preferred direction singled out in space (space looks the same in all directions about a point). Isotropy may be tested for by searching for anisotropy in the 2.7 K background radiation.
that the universe was formed from a single point in space during a cataclysmic explosion about 13.7 billion years ago. This is the current accepted theory for the origin of the universe and is supported by measurements of background radiation and the ...
Compton Gamma-ray Observatory
IRAS Infrared Astronomical Satellite
TPF Terrestrial Planet Finder
NGST Next-Generation Space Telescope
SIM Space Interferometry Mission
Planck Cosmic Background Radiation Field survey ...
 See also: Background, Universe, Light, Time, Galaxies
|
