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Science - Unit II - Universe

STUDY
PLAY
Geocentric
having the earth as the center
Copernicus
Polish astronomer who produced a workable model of the solar system with the sun in the center (1473-1543)
Aristotle
Proposed a geocentric model
Heliocentric
having the sun as the center
Big Bang Theory
the theory that proposes that the universe originated as a single mass, which subsequently exploded
Spiral galaxy
galaxy that looks like a giant pinwheel spinning through space
Elliptical galaxy
a galaxy shaped like a round or flattened ball, generally containing only old stars
Irregular galaxy
A galaxy that goes not have the a regular shape.
Doppler Effect
the apparent change in frequency of electromagnetic or sound waves caused by the relative motions of the source and the observer
red shift
the change in the wavelength of light due to an object moving away from the observer.
blue shift
An increase in the measured frequency of light from an approaching source.
light year
the distance light travels in one year
refraction
bending of a ray of light
reflection
n. The throwing off or back of light, heat, sound, or any form of energy that travels in waves.
convex lens
a lens that is thicker in the middle than at the edges and bends light rays towards one another
concave lens
a lens that is thinner in the middle than at the edges
frequency
the number of complete wavelengths that pass a point in a given time
rotation
the spinning of an object on its axis
divergence
the act of splitting off into different directions
convergence
the state of separate elements joining or coming together
potential energy
Energy that is stored and held in readiness
kinetic energy
Energy in motion
acceleration
The rate at which velocity changes
revolution
the movement of an object around another object