The laws of physics govern the universe, shaping the way galaxies form and stars die from "summary" of The Cosmic Connection by Carl Sagan
The universe is a vast and complex place, filled with countless galaxies, stars, and planets. But despite its immense size and variety, everything in the cosmos is governed by the same set of fundamental laws – the laws of physics. These laws dictate how matter and energy behave on a cosmic scale, determining the formation of galaxies and the life cycles of stars. Galaxies, those majestic islands of stars that dot the cosmic landscape, owe their shapes and structures to the laws of physics. Gravity, the force that pulls all objects towards each other, plays a crucial role in shaping these immense star systems. As clouds of gas and dust come together under the influence of gravity, they begin to collapse and form new stars. Over time, these stars gather together to create the spiral arms and clusters that define the appearance of galaxies. But the laws of physics not only govern the formation of galaxies – th...
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