The Growth of Physical Science

analytical geometry Anaxagoras angles Archimedes Aristotle astronomy atomic weight body centre century charge chemical circle colour conjecture consisted Copernicus curve deflected Democritus Descartes direction discovered discovery distance earth electric electron elements ellipses emitted energy equation ether Euclid experiment explained fall force Galileo geometry gravitation Greek heat helium Hipparchus Huygens hydrogen ideas instance J. J. Thomson Joule Kepler knowledge known Laplace later light lines magnetic mass mathematician mathematics matter measure mechanical methods molecules moon motion nature nebulae Newton nucleus object observed optics orbit oxygen particles physicist physics Plutarch position principle problem produced properties proton Ptolemy Pythagoras Pythagoreans quantity radiation radioactive rays refraction result rotation round the sun scientific seemed seen showed similar simple space speed sphere stars Stevinus substances supposed surface T. L. Heath telescope temperature Thales theorem theory thought Tycho undulatory universe waves