cosmic background radiation temperature

Measurements were taken by NASA’s Cosmic Background Explorer (COBE) satellite. The temperature of the cosmic background radiation is measured to be 2.7 K. What is the wavelength of the peak in the spectral distribution at this temperature? cosmic background radiation "Electromagnetic echo" of the early universe; first predicted by the big bang models in the context of general relativity; later, from the 1960s on, observed with radio telescopes. The actual temperature of the cosmic microwave background is 2.725 Kelvin. CMB provides a way of measuring the spatial curvature of the Universe. This radiation was accidentally discovered by Arno Penzias and Robert Wilson in 1965 and has since then been referred to as the cosmic microwave background (CMB). The intensity of the CMB radiation (as a function of frequency) very closely matches the intensity profile of a blackbody having a temperature of 2.7 Kelvins. The middle image pair show the same map displayed in a scale such that blue corresponds to 2.721 Kelvin and red is 2.729 Kelvin. The cosmic microwave background contains important information about the properties and the earliest history of the universe. The cosmic microwave background contains important information about the properties and the earliest history of the universe. Given the measured radiation temperature of 2.735 K, the energy density of the cosmic microwave background can be shown to be about 1,000 times smaller than the average rest-energy density of ordinary matter in the universe. As to why temperature is a useful variable, it is important to point out that not every photon from the cosmic background has a temperature of 2.7K. Our result, which samples the CMBR far from the near-Earth environment, attests to the accuracy of the COBE measurement and reaffirms the cosmic nature of this background radiation. The thousandfold cosmic expansion since then has redshifted this ubiquitous, largely undisturbed radiation to a blackbody temperature of 2.725 K, with random anisotropies of only a few parts in 10 5 from point to point on the sky." 1993). About the CMB now: The Cosmic Microwave Background radiation (CMB) is radiation that was emitted when the universe was about [math]380,000[/math] years old. The CMB follows a perfect blackbody spectrum with a temperature of 2.725 K (about 3 K, a bit above absolute zero). In fact, there is a whole range of energies (or temperatures). Figure 1. The Cosmic Microwave Background Radiation Perhaps the most conclusive, and certainly among the most carefully examined, piece of evidence for the Big Bang is the existence of an isotropic radiation bath that permeates the entirety of the Universe known as the "cosmic microwave background" (CMB).In 1964, two young radioastronomers, Arno Penzias and Robert Wilson, accidentally … The existence of the cosmic microwave background radiation is a fundamental prediction of hot Big Bang cosmology, and its temperature should increase with … The cosmic microwave background fluctuations are extremely faint, only one part in 100,000 compared to the 2.73 degree Kelvin average temperature of the radiation field.


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