Titlebook: Essential Astrophysics; Kenneth R. Lang Textbook 2013 Springer-Verlag GmbH Germany, part of Springer Nature 2013 Astronomy Textbook.Astrop

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Energy Systems and Energy-Related PracticesThe space between the stars, which looks like an empty black void is filled with cold atoms of hydrogen. Stars form out of this supposed emptiness and eventually return to it.

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Observing the Universe,Astronomy is an ongoing, cumulative science in which astronomers either discover previously unseen constituents of the observable universe or determine physical properties of known ones. They measure the mass, luminosity, distance, size, chemical composition, motion, and magnetic fields of planets, stars, galaxies, and their surroundings.

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Gravity,Look up at the Sun as it glides across the bright blue sky, or watch the Moon’s nightly voyage. On dark, moonless nights you also might notice a bright planet traveling against the stars.

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The Material Between the Stars,The space between the stars, which looks like an empty black void is filled with cold atoms of hydrogen. Stars form out of this supposed emptiness and eventually return to it.

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Origin, Evolution, and Destiny of the Observable Universe,Regardless of the direction in which we look out into space, almost all of the distant galaxies are flying apart, dispersing and moving away at speeds that increase with their distance, as if they had been ejected by a cosmic bomb. Astronomers call it the “big bang”.

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https://doi.org/10.1007/978-3-642-35963-7Astronomy Textbook; Astrophysics Course; Astrophysics Primer; Astrophysics for Undergraduates; Entry-lev

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