Martin J. Rees · 208 pages
Rating: (3.6K votes)
“The sun has adjusted its structure so that nuclear power is generated in the core, and diffuses outward, at just the rate needed to balance the heat lost from the surface-heat that is the basis for life on Earth.”
“Our universe, extending immensely far beyond our present horizon, may itself be just one member of a possibly infinite ensemble. This ‘multiverse’ concept, though speculative, is a natural extension of current cosmological theories, which gain credence because they account for things that we do observe. The physical laws and geometry could be different in other universes, and this offers a new perspective on the seemingly special values that the six numbers take in ours.”
“[The fine structure constant] ... defines how firmly atomic nuclei bind together and how all the atoms on Earth were made. Its value controls the power from the Sun and, more sensitively, how stars transmute hydrogen into all the atoms of the periodic table.”
“A measure of the strength of a body's gravity is the speed with which a projectile must be fired to escape its grasp. It takes 11.2 kilometers per second to escape from the Earth. This speed is tiny compared with that of light, 300,000 kilometers per second, but it challenges rocket engineers constrained to use chemical fuel, which converts only a billionth of its so-called mass 'rest-mass energy' (Einstein's mc^2) into effective power. The escape velocity from the sun's surface is 600 kilometers per second-still only one fifth of one percent of the speed of light.”
“More energy is needed to rise a millimetre above a neutron star's surface than to break completely free of Earth's gravity. A pen dropped from a height of one metre would impact with the energy of a ton of TNT (although the intense gravity on a neutron star's surface would actually, of course, squash any such objects instantly). A projectile would need to attain half the speed of light to escape its gravity; conversely, anything that fell freely onto a neutron star from a great height would impact at more than half the speed of light.”
“The Sun contains about a thousand times more mass than Jupiter. If it were cold, gravity would squeeze it a million times denser than an ordinary solid: it would be a 'white dwarf' about the size of the Earth but 330,000 times more massive. But the Sun's core actually has a temperature of fifteen million degrees-thousands of time hotter than its glowing surface, and the pressure of this immensely hot gas 'puffs up' the Sun and holds it in equilibrium.”
“And the most dangerous place on earth— Is where you’re safe.”
“Absentmindedly, I started doodling in the margins of my paper.
Renee, I wrote in cursive, and then again in bubble letters and then in the loopy handwriting of the mystery note. I drew a tiny picture of the moon above the lake. And then stick figures of people swimming in it. And then for some reason, I wrote Dante. First in print, and then in large, wavy letters, and then in all caps. Dante. Dante. DANTE. I had just finished writing, when I heard someone say my name.
“Renee.”
I shook myself out of my daze to discover that Mr. B. and the entire class were staring at me.
“Earth to Renee. The most primitive tombs. What were they called?” he repeated.
I glanced at my notes for the answer, but they were covered in doodles.
“Dante,” I blurted out, reading the first word I saw. Immediately my face went red. “No, sorry, I meant . . . I meant dolmen.”
I winced, hoping I was right so that I would be saved from further embarrassment. Thankfully, Dante wasn’t in my class.
Mr. B. smiled. “Correct,” he said, returning to the board. He drew a diagram of a stonelike lean-to, which I recognized from the reading. I took notes and kept my head down for the rest of class.”
“Now it's the dark's turn to be afraid.”
“Pray , Mr Tomlinson, be seated. He took his chair over against her. I stood behind hers, that I might give him agreed-upon signals should there be occasions for them.
A thus-A wink of the left eye was to signify, Push that point, captain.
A wink of the right, and a nod was to indicate approbation of what he said.
My forefinger held up, and biting my lip, Get off of that as fast as possible.
A right forward nod, and a frown-Swear to it Captain.
My whole spread hand, To take care not to say too much on that particuliar subject.”
“Take care, Jeffy. I’ll see you soon, right? Just remember not to throw food at the nurses. I don’t want to get any complaint calls, OK?
Steven, I don’t throw food at…oh, that was a joke, right?
Yup, buddy boy. It was a joke. But seriously, no kissing the nurses on the lips, either. It messes up their makeup.
Eeeeeeewwwww!”
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