Astrophysics for People in a Hurry (Astrophysics for People in a Hurry Series)
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Kindle Notes & Highlights
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The universe is under no obligation to make sense to you.
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Einstein’s general theory of relativity, put forth in 1916, gives us our modern understanding of gravity, in which the presence of matter and energy curves the fabric of space and time surrounding it.
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People who believe they are ignorant of nothing have neither looked for, nor stumbled upon, the boundary between what is known and unknown in the universe.
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We are stardust brought to life, then empowered by the universe to figure itself out—and we have only just begun.
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In other words, after the laws of physics, everything else is opinion.
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The LED revolution in advanced lighting technology creates pure visible light without wasting wattage on invisible parts of the spectrum.
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Ordinary matter is what we are all made of. It has gravity and interacts with light. Dark matter is a mysterious substance that has gravity but does not interact with light in any known way.
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where there is mass there is gravity. And where there is gravity there is curved space, according to Einstein’s general theory of relativity.
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the 3-degree temperature of the universe.
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Dark matter and nuclear fusion don’t mix.
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“Matter tells space how to curve; space tells matter how to move.”††††
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Spheres in nature are made by forces, such as surface tension, that want to make objects smaller in all directions.
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For large cosmic objects, energy and gravity conspire to turn objects into spheres.
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our galaxy is flatter than the flattest flapjacks ever made. In fact, its proportions are better represented by a crépe or a tortilla.
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we have: radio waves, microwaves, infrared, ROYGBIV, ultraviolet, X-rays, and gamma rays.
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Contrary to what most people suppose, a planet does not orbit its host star. Instead, both the planet and its host star revolve around their common center of mass.
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Third, recent evidence suggests that shortly after the formation of our solar system, Mars was wet, and perhaps fertile, even before Earth was.
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Collectively, these findings tell us it’s conceivable that life began on Mars and later seeded life on Earth, a process known as panspermia. So all Earthlings might—just might—be descendants of Martians.