By A Zee
Discusses present theories concerning the position of gravity within the universe, and summarizes Einstein's contributions to fashionable knowing of its nature
Read Online or Download An Old Man's Toy: Gravity at Work and Play in Einstein's Universe PDF
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Extra info for An Old Man's Toy: Gravity at Work and Play in Einstein's Universe
II. , ,• , , • • tunnel does not go straight down. We slide down at an angle rather than ':?.. fall straight down. Thus we go slower. On the other hand, there is less '): distance to cover. It turns out that the trip takes forty·two minutes )~. regardless of which two cities we connect ):~. Although we are not going to journey to the center of the earth ? · anytime soon, what we have learned here will be of central importance ) when we discuss the universe and galaxies. To see how, consider a more }, or Jess spherical galaxy.
1 THE RISE OF eRAVITY , I II I aLL _1"11'1 In I I'LL I' .. . 1. II .... II _ • .... :'~.. ~. . , ,, , , , .......... ... ... -.......... ..... .... II .... II .. II .... . II ill •• ..... ,.. , , ·. ~ Can there be antigravity? I once saw a declassified govemmerit~~~~ document studying the capability of enemy nations to produce an antt~~~~ gravity warplane. (It is quite touching, really. The document identifies::g)~ number of Soviet-bloc physicists working on the theory of gravity. )~ Science fiction writers love the notion of antigravity.
1 ~ .. ~ 1 ~ .. 1 , , ~ 1 1 1 , •• ... ~ ... •• .... 1 1 1 .. •.... , • , ... •.... 1 1 , • • •~ 1 1 , ~ ... ~ .... . " In physics, theory of gravity, Dhvsiciltts haJ)lperled. Upon first With theory of gravity could now conthe universe itself. Not only did bow>stars and was able to move around in tbe curved universe, how the masses contained in curve space and time, fabric of the universe. A new cosmology was at hand. While the stars and cavort about, would space and time still and not respond?