The solar system

The solar system

by Maximiliano Martinez Cordera

Historical models of the solar system​

Lesson 1

Mr. Martinez​

Multiple Choice

The sun and planets circle the Earth

• True

• False

Multiple Choice

Most early astronomers placed the sun as the center of the solar system

• True

• False

Multiple Choice

The planets orbit the sun in ellipses

• True

• False

Multiple Choice

The telescoped helped to improve our understanding of the solar system

• True

• False

The solar system​

The solar system ​is the sun and all of the bodies that orbit the sun

​Heliocentric

​Geocentric

​Solar system models

​Who proposed solar system models

• Aristotle​

• ​Aristarchus

• Ptolomy

• ​Copernicus

• ​Kepler

• ​Galileo

​Aristotle (384-322 BC)

​He thought that the Sun, Moon, and planets orbit around the Earth

​

​If the Earth rotated around the Sun the position of the stars would change as the Earth moves

​

​This apparent shift is known as parallax

​Aristarchus (310-230 BCE)

​Proposed a heliocentric model

​

His model has not accepted UwU

​

​He tried to measure the distances to the Moon and the Sun

​

Although he fail, this was a huge contribution to science

​Ptolemy (100 - 170 CE)

• Geocentric model used for 14 centuries

• Celestial bodies travel in a perfect circle ​

• ​They travel at a constant speed

• Allowed the prediction of the motion of planets in the future

​Copernicus (1473-1543)

• ​Heliocentric model using Aristarchus model

• ​The planetary paths should be perfect circles

• ​The first step of modern models of the solar system

​Kepler (1571-1630 CE)

​He realized that planetary motions are elliptical instead of circular

​

​He formulated three principles

​

1. ​Planetary orbits are ellipses with the sun as the focus

2. ​Planets move faster as they are close to the sun

3. ​It relates the distance of a planet to the sun to the time it takes to go one around its orbit

​Galileo (1564-1642)

• ​He improved the telescope

• ​Discover some moons of Jupiter

• ​He showed that the Earth is not the only body that can be orbited

• ​Demonstrated Venus faces

Multiple Choice

Take one pen and another thing of different mass and drop them to the floor at the same time. Which one strikes first the floor?

• The pen

• The object B

• They reach the floor at the same time

Open Ended

What were Galileo's most important contributions to astronomy?