How is the universe changing by cosmic background radiation?

Answer 1

In a nutshell, the universe is expanding, and it will either expand forever, or there will be enough matter in the universe to slow down that crazy expansion and then pull everything back together. (There isn't much chance of a "steady state" option, but there are some things to review with that.) When we look around out there in space, we see lots of matter. But it's acting funny. It is acting as if there is more matter that is gravitationally influencing it that is visible. That's dark matter. It's the only way to explain things so far. Perhaps there is enough dark matter in the universe to slow the expansion up and keep everything from just flying apart to infinity. Is there? Use the link to the Wikipedia article on dark matter and get up to speed so you can make the call from an informed point of view.

Answer 2

Cosmic background radiation is leftover radiation from a very early stage in the development of the Universe. It is a landmark piece of evidence for the Big Bang. Due to its near-perfect uniformity, scientists conclude that it must have originated at a time when the Universe was much smaller, hotter, and denser.

It has become widely accepted in the scientific community that the Universe, along with space and time, expanded very rapidly from a tiny singularity in an event known as the Big Bang. This happened around 13.7 billion years ago, a very long time indeed! At first, all that existed was energy. Within a fraction of a second after the Big Bang, energy was converted into subatomic particles such as quarks and electrons (made possible by Einstein's famous equation, E = mc2). Quarks came together to form protons and neutrons. The Universe at this point was still extremely hot, but was progressively cooling down as it expanded and became less dense. Protons and neutrons came together to form hydrogen and helium nuclei.

For thousands of years after the Big Bang, all that existed was an opaque "fog" of hydrogen plasma. The reason the Universe was opaque is because photons remained bound to matter due to the extreme heat, meaning they could not move freely without being re-absorbed by electrons. However, the Universe continued to expand, and once the temperature was sufficiently cool, electrons joined with nuclei to form stable atoms, and thus could no longer hold onto the photons. In an event known as decoupling, the radiation was released in a cosmic burst of light, and the Universe became transparent for the first time.

This "burst of light" is what we now observe as the cosmic microwave background radiation. It is the afterglow of the Big Bang, and as a result of the continual expansion of the universe, the light waves of this radiation have stretched out to longer wavelengths which today exist in the microwave region of the electromagnetic spectrum.

Answer 3

Well the cbr is the remainder of what happened just after the big bang. The fact that we can detect cbr is fascinating to many scientists worldwide because it is our proof today that there was some sort of incredible explosion long ago. This cbr is seen only at a distance because when we look at the night sky we ate seeing light that is reaching our eyes from a distance and cbr is way out there and by being Si far out it is Si far it came from or own big bang. So what we see as cosmic background radiation, is really the explosion from the big bang.

Answer 4

They are used to study solar wind (radiation from the sun and stars).

Date the universe based on particles being emitted from the source and intensity.

Study chemical abundance in the universe

Answer 5

We know that dark matter exists because it got gravity, though it is invisible. It hold galaxy and Universe.

There is a theory there many other parallel universe outside our universe and dark matter holds those universe up and some scientists says that dark matter are just mass of the matter of the parallel universe. It sounds crazy but that is the Law of Physics.

However there is not exact explanation of what dark matter really is, so there are still Noble Prices for those who can come up with a reasonable explanation

Answer 6

Cosmic background radiation is detected as a faint glow with radio telescopes and is not associated with any stellar phenomena. It occurs in all directions and is pretty uniform. The reason it is associated with the Big Bang Theory is because as a model, the theory explains the presence of the background radiation well, since as the universe expanded and cooled, the radiation did too. Although several explanations for the universe's beginning are currently theorized, the Big Bang theory best explains the cosmic background radiation's presence since the Big Bang models for the Universe's rapid expansion from a singular point. For a more in depth look, I'd check out the wikipedia article on "cosmic microwave background radiation".

Answer 7

The Cosmic Microwave Background, or CMB, is a nearly-isotropic 2.725 K signal which formed during the epoch of recombination (when the universe went from being mostly ionized to mostly neutral) approximately 300,000 years after the big bang.

The early universe was dense and hot. So hot, in fact, that it was impossible for neutral atoms to form; instead nearly all baryonic matter was in the form of ions, or charged particles. In an ionized universe, photons (light particles) travel only a short distance before being scattered by an ion. As the universe expanded and cooled, it became possible for neutral atoms to form. This is known as the epoch of recombination and occurred approximately 300,000 years after the big bang. Once the universe became neutral, photons could travel great distances without being scattered. In fact many photons have never been scattered since the universe became neutral. These photons have been traveling in a straight line ever since that "surface of last scattering" approximately 300,000 years after the big bang. By observing thses photons, we can see a "picture" of what the universe looked like at the time of the surface of last scattering.

Answer 8

The cosmic background radiation helps confirm the Big Bang theory - which predicted that there should be such a background radiation, as a remnant of an early hot Universe.

Also, it can - and is - being studied to learn more details about the early Universe.

Answer 9

Astronomers believe the cosmic background radiation is the resultant left over (remaining) energy emitted from the Big Bang. As such, the background radiation would have been emitted at the moment the Big Bang occured.

The Cosmic Microwave Background, or CMB, is a nearly-isotropic 2.725 K signal which formed during the epoch of recombination (when the universe went from being mostly ionized to mostly neutral) approximately 300,000 years after the big bang (which itself happened about 13.7 billion years ago)

The early universe was dense and hot. So hot, in fact, that it was impossible for neutral atoms to form; instead nearly all baryonic matter was in the form of ions, or charged particles. In an ionized universe, photons (light particles) travel only a short distance before being scattered by an ion. As the universe expanded and cooled, it became possible for neutral atoms to form. This is known as the epoch of recombination and occurred approximately 300,000 years after the big bang. Once the universe became neutral, photons could travel great distances without being scattered. In fact many photons have never been scattered since the universe became neutral. These photons have been traveling in a straight line ever since that "surface of last scattering" approximately 300,000 years after the big bang. By observing thses photons, we can see a "picture" of what the universe looked like at the time of the surface of last scattering.

Answer 10

With a radio telescope around the microwave region of the radio spectrum.

If you don't happen to own a radio telescope, just tune your TV to any frequency that doesn't have a station, and when you see that "black and white fuzz", a small part of that is cosmic background radiation.