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SPACE UNIT GRADE 9 SCIENCE
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THE SOLAR SYSTEM 312-04 DESCRIBE AND EXPLAIN THE APPARENT MOTION OF CELECTIAL BODIES: MOON, SUN, PLANETS, COMETS, ASTEROIDS 312-05 DESCRIBE THE COMPOSITION AND CHARACTERISTICS OF THE FOLLOWING COMPONENTS OF THE SOLAR SYSTEM…TERRESTRIAL AND GAS PLANETS.
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BY THE END OF THIS LESSON… EVERYONE SHOULD KNOW… That there are inner and outer planets, at one time we thought earth was the center of the universe, all parts of the solar system are in motion MOST PEOPLE SHOULD BE ABLE TO… Describe solar system theories, and differences between the planets SOME PEOPLE WILL BE ABLE TO… Explain retrograde motion in depth and connect retrograde motion with the heliocentric model
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ONCE UPON A TIME… The Earth was thought to be the center of the Universe (Aristotle) “____________” The dominant theory for about 2000 years In the Renaissance (1500s), Copernicus proposed the Sun-centered model: : “____________” Possible because of new technology and extensive observation https://www.youtube.com/watch?v=KESAUT6_iYM
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OUR SOLAR SYSTEM We have the Sun and 8 planets, plus 1 dwarf planet (Pluto) The 4 inner planets are ______________ The 4 outer planets are ______________ They are divided by an ______________ No two planets are alike in their composition 4:38-20-18 https://www.youtube.com/watch?v=nOLc-ZSdvpQ
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TERRESTRIAL PLANETS Closest to the Sun is ______________, Earth and Mars These planets have a ______________ composition Earth is SO FAR the only planet in our solar system identified as having ______________
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GASEOUS PLANETS Past the ______________, is Jupiter, Saturn, Uranus, Neptune and Pluto Jupiter is our largest planet in the system These planets are far enough from the sun ______________ They are largely made of Hydrogen and Helium (EXPLOSIVE) http://www.nasa.gov/multimedia/imagegallery/image_feature_413.html
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MOTION IN THE SOLAR SYSTEM https://www.youtube.com/watch?v=z8aBZZnv6y8 Everything is moving! ______________ are always changing The sun is moving and rotating (more on that later) The planets all have their own ______________ The orbits are not round, they are ______________ Each planet has its own path, the further away the bigger the path Ie: Mercury’s year is 3 months, but Saturn is almost 30 years
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RETROGRADE MOTION https://www.youtube.com/watch?v=72FrZz_zJFU https://www.youtube.com/watch?v=72FrZz_zJFU https://www.youtube.com/watch?v=piBBQTkoQ9c https://www.youtube.com/watch?v=piBBQTkoQ9c Retrograde motion is when a celestial body appears to change direction from usually east to west ______________ This happens because the Earth’s orbit is shorter than the orbit of the other planet/object
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HOW FAR? Because space is so big it is ______________ Light year: the distance a beam of light travels in a vacuum (space) in 1 year Approximately 9 460 000 000 000 km 9.46 Trillion km
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PRACTICE QUESTIONS 1. What is the difference between heliocentric model and geocentric model 2. How many km are in 3 light years? 3. Which planets are closer to the Sun than Earth? Which are further? 4. What is special about the inner planets? The outer planets? What divides them? 5. What is retrograde motion? How did it help with the model of our solar system/Universe?
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