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