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Our Solar System

Definition
solar system The Sun together with the group of celestial bodies that are held together by its attraction and revolve around it.
planet an object that orbits a star , is large enough to be nearly spherical in shape, and has no other object in its orbital path
orbit the path an object follows as it moves around another object
ellipse a stretched-out-circle
eccentricity the measure of how far an object's orbit is from being circular
gravity an attractive force that exist between all objects that have mass
momentum a measure of how hard it is to stop a moving object
inertia the tendency for objects in motion to resist changes to their direction and speed
period of revolution the time it takes an object to travel once around the Sun
period of rotation the time it takes an object to complete one rotation
astronomical unit the average distance from Earth to the Sun
Sun the star in the center of our solar system around which the planets revolve and receive light
dwarf planet an object that orbits a star and is nearly spherical in shape but shares its orbital path with other objects of similar size but also isn't classified as a satellite
moon a natural satellite of a planet
meteor a meteoroid that has entered Earth's atmosphere and produces a streak of light
asteroid a small, rocky object that orbits the Sun
comet a small, rocky, icy object that orbits the Sun
Kuiper Belt a band of small celestial bodies beyond the orbit of Neptune
Oort Cloud a spherical shell of celestial bodies believed to surround the Sun far beyond he orbits of the outermost planets
astrobiology the study of the origin development, distribution, and future of life in the Universe
habitable zone the area around a star where it is not too hot and not too cold for liquid water to exist on the surface of surrounding planets
extremophile an organism that lives under extreme environmental conditions
greenhouse effect The natural process that occurs when certain gases in the atmosphere absorb and reradiate thermal energy from the Sun
exoplanet any planet outside our solar system
Created by: pharristx
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