Cosmice microwave background radiation

The Cosmic Microwave Background radiation, or CMB for short, is a faint glow of light that fills the universe, falling on Earth from every direction with nearly uniform intensity. When we make maps of the temperature of the CMB, we are mapping this surface of last scattering. 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.

The team was doing research related to Big Bang nucleosynthesis, or the production of elements in the universe besides the lightest isotope type of hydrogen. Cosmologists studying the cosmic microwave background radiation can look through much of the universe back to when it was opaque: a view back toyears after the Big Bang.

Cosmice microwave background radiation

A simple consequence of these ideas is that as you look at more and more distant objects, you're seeing farther and farther back in time--sometimes very far back indeed. Essentially, they realized that in order to synthesize the nuclei of these elements, the early Universe needed to be extremely hot. When this cosmic background light was released billions of years ago, it was as hot and bright as the surface of a star. The ultraviolet light re-ionized the gas, freeing a lot of electrons. The universe could not have been perfectly uniform, though. You can unsubscribe at any time and we'll never share your details without your permission. For all of these reasons the photons could then travel long distances without running into some particle. Longer wavelengths of light are able to more easily to pass through gas. The colors for the temperatures range from blue for 2. Dense hot gases will produce a continuous spectrum that depends only on the temperature a thermal spectrum. Moreover, the fluctuations are coherent on angular scales that are larger than the apparent cosmological horizon at recombination. Why study the Cosmic Microwave Background? The Universe was made of a "plasma", or ionised gas, which is what the surface of the Sun is made of.

Suddenly, this point began expanding, and the Universe as we know it began. Description: The CMB is essentially electromagnetic radiation that is left over from the earliest cosmological epoch which permeates the entire Universe.

In addition to this cosmic microwave background radiation, the early universe was filled with hot hydrogen gas with a density of about atoms per cubic centimeter.

In particular, the spectral radiance at different angles of observation in the sky contains small anisotropiesor irregularities, which vary with the size of the region examined.

The picture at left shows a false color depiction of the temperature brightness of the CMB over the full sky projected onto an oval, similar to a map of the Earth.

cosmic microwave background radiation simple explanation

And in the course of looking farther out into space, and deeper back in time, cosmologists have discovered some truly amazing things.

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The Cosmic Microwave Background