Barycenter - the center of mass of two or more bodies that orbit one another, Nutation - Wobbling around the precessional axis ½ degree one way or the other, Precession - Change in the direction of the axis of the Earth, but without any change in tilt, Photosynthesis - Process plants convert solar energy to chemical energy, Fission - the splitting of large nuclei of certain isotopes into smaller nuclei along with the release of energy with several free neutrons, Fusion - Fusion occurs when two light atoms bond together, or fuse, to make a heavier one with release of huge amount of energy, Biosphere - part of the earth where life exist, Kepler's first Law - A planet’s orbit is an ellipse with the sun at one focus and nothing at the other focus, Kepler's Second Law - the line joining the planets to the Sun sweeps out “equal areas in equal times” as the planet travels around the ellipse, Equinox - time of the season when the sun passes directly over the equator and the length of the day is equal to the length of the night , Winter - Time of the year when either hemisphere is tilted away from the sun, Summer - Time of the year when either hemisphere is tilted towards the sun, Latitudes - Imaginary lines that run from east to west on the globe, Longitudes - imaginary line that run from north to south on the globe, Rotation - to the circular motion of the Earth (or another body) around an internal central axis or point, Revolution - the object's orbital motion around another object., Mesosphere - region of the upper atmosphere between about 50 and 80 km (30 and 50 miles) above the surface of the Earth, Stratosphere - is the second layer of the atmosphere as you go upward. The bottom of the stratosphere is around 10 km (6.2 miles or about 33,000 feet) above the ground at middle latitudes, Thermosphere - a layer of Earth's atmosphere that is directly above the mesosphere and below the exosphere, Exosphere - he uppermost region of the Earth's atmosphere and has no clear upper boundary since it gradually fades into outer space,

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