Miss R.Bisbal

EARTH AND SPACE PAST AND PRESENT MODELS OF THE SOLAR SYSTEM

Astronomer- people who study the stars and other objects in space.

Lots of years ago without the help of a telescope scientist had a hard time mapping the universe and describing the solar system.

Telescope- Instrument designed for the observation of remote objects.

Solar system- a group of celestial bodies traveling around a sun.

PTOLEMY’S MODEL Greek astronomer Ptolemy suggested a

model of the universe that placed the planets, moon and sun revolving paths around the earth.

center

COPERNICUS’S MODEL Later on Nicholas Copernicus (Polish)

proposed a model of the universe that placed the sun in the center and the planets, including the earth, revolving around it.

center

LETS THINK IT THROUGH!COMPARE THE MODELS OF THE UNIVERSE DISCUSSED.

1. Which model best describes a solar system?

2. How is the position of the earth different in each model?

3. How many planets were know at the time of Ptolemy and Copernicus?