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21 " To other scientists, the scientist who corrects a colleague’s error, or cites good reasons for seriously doubting his or her conclusions, performs a noble deed, like a Zen master who boxes the ears of a novice straying from the meditative path, although scientists correct one another more as equals than as master and student. "
― Neil deGrasse Tyson , Origins: Fourteen Billion Years of Cosmic Evolution
22 " Astrobiologists now believe that the existence of life throughout the universe requires: 1. a source of energy; 2. a type of atom that allows complex structures to exist; 3. a liquid solvent in which molecules can float and interact; and 4. sufficient time for life to arise and to evolve. "
23 " Although we have no guarantee that the Copernican principle can guide us correctly in all scientific investigations, it provides a useful counterweight to our natural tendency to think of ourselves as special. Even more significant is that the principle has an excellent track record so far, leaving us humbled at every turn: Earth does not occupy the center of the solar system, nor does the solar system occupy the center of the Milky Way galaxy, nor the Milky Way galaxy the center of the universe. And in case you believe that the edge is a special place, we are not at the edge of anything, either. "
24 " discovery of enormous masses of organisms at depths a mile or more beneath the basalts of Washington State, living mainly on geothermal heat, suggests that we may someday find the Europan oceans alive with organisms unlike any on Earth. But one pressing question remains: Would we call the creatures Europans or Europeans? Mars "
25 " Al principio, era la física. La "
26 " It took the mind of Albert Einstein, the twentieth century’s most brilliant and influential, to show that we can more accurately describe gravity’s action-at-a-distance as a warp in the fabric of space-time, produced by any combination of matter and energy. "
27 " la materia le dice al espacio cómo curvarse, y el espacio le dice a la materia cómo moverse. "
28 " Las personas que creen que lo saben todo nunca han buscado ni se han encontrado con los lindes entre lo conocido y lo desconocido en el cosmos. Y "