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Unit 3

The Solar System

TermDefinition
Solar system The solar system is the sun and all of the bodies that orbit the sun.
heliocentric In the heliocentric model, Earth and the other planets orbit the sun.
geocentric These models, which used Earth as the center, are called Earth-centered
Gravity Gravity is a force of attraction between objects that is due to their masses and the distances between them.
orbit An orbit is the path that a body follows as it travels around another body in space.
aphelion When an object follows an elliptical orbit around the sun, there is one point
perihelion where the object is closest to the sun.
Centripetal force The inward Force required to keep particle or an object moving in a circular path.
Solar nebula A rotating cloud of gas and dust from which the sun and planets formed.
Planetesimal A small body from which a planet originated in the early stages of development of the solar system
Nuclear fusion The process by which nuclei of small atoms combine to form a new, more massive nucleus; the process releases energy.
Sunspots A dark area of the photosphere of the sun that is cooler than the surrounding areas and that has a strong magnetic field
Solar flare An explosive release of energy that comes from the sun and that is associated with magnetic disturbances on the sun's surface.
Prominence A loop of relatively cool, incandescent gas that extends above the photosphere and above the sun's edge as seen from Earth.
Terrestrial planet One of the highly dense planets nearest to the sun Mercury, Venus, Mars, and Earth.
Astronomical Unit The average distance between Earth and the sun; approximately 150 million kilometers symbol, AU.
Created by: user-1855767
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