Celestial mechanics planetary positions, using geometrical or arithmetical techniques, and contemporary discussions of the physical causes of the planets' motion. Johannes Kepler (1571–1630) was the first to closely integrate the predictive geometrical astronomy, which had been dominant from Ptolemy in the 2nd century to Copernicus, with physical concepts to produce a "New Astronomy, Based upon Causes, or Celestial Physics" in 1609. His work led to the modern laws of planetary orbits, which he developed using his physical principles and the planetary observations made by Tycho Brahe. Kepler's model greatly improved the accuracy of predictions of planetary motion, years before Isaac Newton developed
Planetary civilization is planetary, consuming all energy that is available from a neighboring star, or about 10 watts. A Type II civilization is stellar, consuming all the energy that their star emits, or 10 watts. A type III civilization is galactic, consuming the energy of billions of stars, or about 10 watts. Carl Sagan suggested defining intermediate values (not considered in Kardashev's original scale) by interpolating and extrapolating, according to his calculations, the modern state of the present human civilization is expressed by a value about 0.7. Theoretical physicist Michio Kaku, in a book, "Physics of the Future", published in 2011, stated