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Welcome to our Physics lesson on Cosmic Radiation, this is the sixth lesson of our suite of physics lessons covering the topic of Galaxies and Hierarchic Structures in the Universe, you can find links to the other lessons within this tutorial and access additional physics learning resources below this lesson.
Cosmic radiation is an important component of the Universe. It does not belong to any of the star structures mentioned above but it fills, uniformly, the entire Universe. As a result, the absolute temperature can never be 0 K, no matter how far away a celestial object is from the closest star but its temperature is 2.73 K exactly. Cosmic radiation is isotropic (equal in all directions), and it has the same features of a black body at 2.73 K. For this reason, the temperature of the sky is taken as 2.73 K.
You have reached the end of Physics lesson 22.6.6 Cosmic Radiation. There are 7 lessons in this physics tutorial covering Galaxies and Hierarchic Structures in the Universe, you can access all the lessons from this tutorial below.
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