The Story of Science

alpha particles alpha rays ancient animal astronomers atmosphere atomic theory atomic weight attractive force bacteria beam believed biologist body bright bryophyte called caused cells century chemical elements chromosphere clouds comet composed consists constellation contains craters Cro-Magnon crystal diameter discovery distance earth earth's crust eclipse Einstein electrical energy evolution existence experiments fact feet fossils galaxy Galileo gases Geologists gravitational Greek heavens hydrogen known lava light light-years liquid magnitude mass matter Michelson-Morley experiment miles million modern molecules molten moon motion mountains moving nature nebula negative electrons neurons Newton nucleus Observatory observer ocean orbit organisms oxygen Paleozoic peridotite period Photograph physicist physics Piltdown planets positive electron Prof protoplasm radium rays result reveals revolving river rock layers rotation scientists shell showed solar system space stars structure substances sun-spots surface telescope temperature thallophytes theory of relativity tiny tion types universe volcanoes waves X-rays