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Welcome to our Physics lesson on Observing Cosmic Radiation, this is the third lesson of our suite of physics lessons covering the topic of Formation of Galaxies and Solar System. Actual Problems, you can find links to the other lessons within this tutorial and access additional physics learning resources below this lesson.
Observation and extraction of useful information from cosmic radiation is the main method used to confirm the possible models of galaxies and other celestial structures formation. Giving that during the first few hundred thousand years of its existence, cosmic radiation has been in equilibrium with matter, it has shared the same features with this matter. Hence, by observing and analyzing the features of cosmic radiation (such as homogeneity and isotropy), scientists have been able to draw conclusions about the homogeneity of matter in the Universe at 300 000+ years after the Big Bang when galaxies began to create.
Careful observations of cosmic radiation made in 1990s have confirmed that it is not completely isotropic, as it was previously believed. Its density changes very slightly when measured in various directions. This difference in density is not more than 1/10000. In this way, the theory of difference in matter fluctuations in the ancient Universe and the versions of galaxies formation resulting from this theory were confirmed.
You have reached the end of Physics lesson 22.12.3 Observing Cosmic Radiation. There are 7 lessons in this physics tutorial covering Formation of Galaxies and Solar System. Actual Problems, you can access all the lessons from this tutorial below.
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