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Geocentric model
Model of the Solar System with the Earth in the center.

Heliocentric model
A representation of the relationship between the Sun and planets in which the planets revolve around the Sun.

Ptolemy
Known for creating and popularizing the geocentric model.

Copernicus
First astronomer to propose the heliocentric model

Tycho Brahe
Took very detailed records and notes of the sky (silver nose)

Kepler
Used Brahe's notes to discover planets have elliptical orbits.

Galileo
Used a telescope to provide evidence for a heliocentric model.

Telescope
A tool used to view distant objects by making them appear larger.

Isaac Newton
Created a mathematical law describing gravity.

Albert Einstein
Known for his theories of gravity published in 1916 (special relativity and general relativity)

ellipse
A elongated circle, or oval shape, the shape of the planets orbit.

Solar System
planets, and all the other objects that revolve around the sun (a star)
