Compared to when the cosmic microwave background was first released, the radiation of the cosmic microwave background today is __________.

fainter and has most of its photons at longer wavelengths More test answers on https://studyhippo.com/astro-wk-7-mastering-astronomy-chp-22/

If observations had shown that the cosmic microwave background was perfectly smooth (rather than having very slight variations in temperature), then we would have no way to account for___________.

how galaxies came to exist More test answers on https://studyhippo.com/exam-3-practice-quiz-39389/

Which statement about the cosmic microwave background is not true?

It is the result of a mixture of radiation from many independent sources, such as stars and galaxies. More test answers on https://studyhippo.com/chapter-17-astronomy/

The idea of dark matter arose to explain gravitational effects observed in galaxies and clusters of galaxies. However, studies of the early universe (especially the cosmic microwave background and of chemical abundances) also tell us something about dark matter. What do they tell us?

They add further support to the idea that dark matter really exists and is made of non-ordinary (nonbaryonic) matter, such as WIMPs More test answers on https://studyhippo.com/chapter-17-astronomy/

photons of cosmic microwave background released

Sometime after the first five minutes More test answers on https://studyhippo.com/astronomy-chapter-23-sorting-task/

cosmic microwave background (CMB) radiation

Isotropic microwave radiation from every direction in the sky having a 2.73-kelvin (K) blackbody spectrum. The CMB is residual radiation from the Big Bang. More test answers on https://studyhippo.com/astronomy-10-exam-1-ch-16/

The cosmic microwave background refers to

The leftover radiation from the Big Bang, last emitted at the end of the era of nuclei, and redshifted into the microwave part of the electromagnetic spectrum. More test answers on https://studyhippo.com/exam-3-practice-quiz-39389/

Cosmic Microwave Background Radiation

the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about 2.725 kelvin More test answers on https://studyhippo.com/astronomy-final/

The cosmic microwave background is the highly redshifted radiation of the early Big Bang.

True More test answers on https://studyhippo.com/mastering-astronomy-chapter-17-33630/

Cosmic microwave background radiation (CMB)

The CMB is electromagnetic radiation in the microwave region that fills the universe. It has a blackbody spectrum corresponding to a temperature of about 2.7K. It is the remnant of the high temperatures at the time of the Big Bang and provided one of the strongest pieces of evidence in favor of the Big Band model. More test answers on https://studyhippo.com/physics-option-e-astrophysics/

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Cosmic Microwave Background Flashcards, test questions and answers

Discover flashcards, test exam answers, and assignments to help you learn more about Cosmic Microwave Background and other subjects. Don’t miss the chance to use them for more effective college education. Use our database of questions and answers on Cosmic Microwave Background and get quick solutions for your test.

What is Cosmic Microwave Background?

The Cosmic Microwave Background (CMB) is a faint glow of electromagnetic radiation that fills the entire Universe, and is one of the most important pieces of evidence for the Big Bang Theory. The CMB was first detected by two American physicists in 1964, Arno Penzias and Robert Wilson, who were conducting experiments with a radio antenna at Bell Labs in New Jersey.The CMB has its origin in the hot early Universe; approximately 380,000 years after the Big Bang. As the Universe expanded and cooled, photons were able to travel freely through space for longer distances before interacting with matter. This allowed them to reach us here on Earth today as microwave radiation. Because this radiation has been travelling across space for billions of years without interacting with anything else, it carries with it very valuable information about what our Universe was like at its birth. Analysis of the spectrum of this cosmic background radiation can offer us insights into many aspects of cosmology such as dark energy, dark matter and inflationary theory; all topics which are still active areas of research today. The data gathered from studying this original cosmic energy also allows scientists to test some fundamental physical constants such as speed of light or Newton’s gravitational constant – all without ever leaving Earth. In addition to being an invaluable tool for understanding cosmology, this ancient light also provides us with a stunning visual reminder that we are part of something much larger than ourselves – an expanding universe full of secrets just waiting to be uncovered. So take a moment next time you look up at night sky and remember that you are looking out into a vast sea filled with ancient light – our Cosmic Microwave Background.