P^2 (Earth years) = a^3 (astronomical units)
P = period
a = semi-major axis of elliptical orbit
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Kepler's third law of planetary motion is a mathematical relation between orbital periods and distances. It allows astronomers to measure masses of celestial objects. Johannes Kepler went to work for Tycho Brahe near the end of Tycho's life. When Tycho died, Kepler used Tycho's data to deduce three laws of planetary motion. Because Tycho's data were far more accurate than any previously collected data on planetary positions neither Ptolemy's nor Copernicus's models of the cosmos worked.
By many volcanic eruptions eventually forming an island.
Articulations.
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Photosynthesis and cellular respiration are connected through an important relationship. This relationship enables life to survive. The products of one process are the reactants of the other. Photosynthesis makes glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with water to form water.
Photosynthesis and cellular respiration are also an important part of Carbon cycle.