1. Kepler’s Laws

2. Bellringer On your own sheet of paper and without looking at the book list Kepler’s Laws of Planetary Motion. We will be grading these in class.

3. Link Activity In groups of three you will be making a 4 paper poster (see examples on the board on what at 4 paper poster looks like). Paper 1= Title and group member names Paper 2= Kepler’s 1 st Law Paper 3= Kepler’s 2 nd Law Paper 4= Kepler’s 3 rd Law

4. Link Activity Name of law ( Equal Areas, Ellipses, or Periods) Definition of law in your own words Analogy and explanation Picture of analogy Color

5. Link Activity Name of law ( Equal Areas, Ellipses, or Periods) Definition of law in your own words Analogy and explanation Picture of analogy Color

6. Astronomers Contributions 1. Revised the reflective telescope and uses it to discover the moons of Jupiter, sunspots, and craters on the moon. 2. Proposed the geocentric model of the solar system 3. Proposed the heliocentric model of the solar system

7. Astronomers Contributions 4. Predicts motions of the sun, moon, stars, and planets. 5. Proposed the three laws of planetary motion. Protégé to Brahe. 6. Discovered that comets were further from the Earth than the moon. Gathered years of precise observational data with minimal equipment.

8. ES.2.2 Understand that and describe how in the 16th century the Polish astronomer Nicholas Copernicus suggested that all those same motions outlined by Ptolemy could be explained by imagining that the Earth was turning on its axis once a day and orbiting around the sun once a year. Note that this explanation was rejected by nearly everyone because it violated common sense and required the universe to be unbelievably large. Also understand that Copernicus’s ideas flew in the face of belief, universally held at the time that the Earth was at the center of the universe.

9. Kepler’s Laws Law 1: Law of Ellipses. Planets travel in an elliptical (oval) shape around the sun Law 2: Law of Equal Areas. The closer the planet is to the sun that faster it will go around the sun because of the gravitational pull of the sun. Law 3: Law of Periods. The closer the planet is to the sun the less distance is has to move to go around the sun.

10. Ch. 27 Vocabulary Gravity- The force that exists between two bodies in the universe Planet- Any of the 8 primary bodies that orbit the sun Orbital Period- The time required for a body to complete a single orbit Solar Nebula- A rotating cloud of gas and dust that gave rise to the Earth’s solar system

11. Vocabulary Cont. Planetesimal- A small body from which a planet originated in the solar system’s early development. Protoplanet- A large body formed when planetesimals joined together. Ultraviolet Radiation-Visible light that has SHORTER wavelengths than those of light Infrared Radiation- A part of the electromagnetic spectrum with waves LONGER than those of light

12. Rotation- The spin of a body on its axis. Ex. Earth spinning around itself Revolution-The motion of one body around another body in space. Ex. Earth moving around the sun