Our Solar System An Inventory of the Solar System FREE-WRITE ! 2 minutes: Everything you know (can remember) about the solar system

Nebular Hypothesis “Sorting” differentiation

Ancient Greek Astronomers’ Solar System consisted of….. Earth (geocentric) Our Moon One Sun Fixed Stars 5 wandering planets: _______, ________, _________, _______, _______ _______: long wispy strands of light that were visible for weeks and slowly faded ________: shooting stars, bright streaks of light that shoot across the night sky. Comets Meteors Mercury Venus Mars Jupiter Saturn

17 th Century Solar System Galileo used a telescope to discover: Copernicus: heliocentric (Sun- centered) Moons around Jupiter, craters on the moon, phases of Venus

Nebular Hypothesis 1 nebula of dust and gas 2 rotating and contracting, Center heating 4 Sun formed with 99% of the matter. Planets were ‘clumping” dust into rock and ice bits 5. “ Planets” continued to cool and form 3. Sorting: heavy matter went to center, light matter was flung out.

The Inner and Outer Planets Planets are “sorted” into two broad categories Terrestrial: four planets closest to the Sun; rocky Jovian: farthest from the Sun; gaseous Pluto?

19 th Century discoveries in the Solar System added….. Saturn's’ Rings The planets Uranus & Neptune Minor planets called dwarfs The Asteroid Belt between Mars and Jupiter

20 th Century discoveries in the Solar System added:….. Kuiper Belt beyond Neptune Non-optical “seeing” using radio and infrared waves Space flight: manned space craft and un-manned space probes Hubble Telescope

So….Let’s Take An Inventory of our Solar System Our solar system is (heliocentric) centered around a single star; the Sun. 8 Planets, in order of distance from the Sun: _______, _____, _____, ____, ______, ______, ______, ______ My Very Exceptional Mother Just Served Us Nachos

Let’s Take An Inventory Some of the planets have moons, totaling _______at last count. Currently scientists have observed more than 500,000 asteroids. located in an Asteroid belt between _____ and ___________.  They are debris from the formation of the solar system. ( or a broken planet???) Kuiper Belt: a region beyond Neptune where icy bodies orbit 146

Overall Layout of the Solar System Orbits of all planets are ellipses  (not perfectly round – slightly oval) They are NOT evenly spaced distance from the Sun They all orbit counter-clockwise They orbit on the same flat orbital plane (except Mercury tilts 7° and Pluto tilts 17°!)

Overall Size of the Solar System It’s IMMENSE! HUGE! _________ AU across 1 AU is the distance from the Earth to the Sun or 93,000,000 miles So… (that’s ______________ miles) _solarsystem.htmlhttp://joshworth.com/dev/pixelspace/pixelspace _solarsystem.html the moon at 1 pixel 80

4 Inner (terrestrial) Planets4 Outer (Jovian) Planets -Close to Sun -Rocky composition -Far out from Sun -Gassy composition The Planets: Summarize the differences between the Inner and Outer Planets

Bellwork - notebook 1. Which planets are called the terrestrial planets? 2. Where is the asteroid belt located? 3. Which planets are spaced farther apart?

Bellwork 1. Which planets are the LARGEST? Smallest? 2. How many times larger (diameter) is the SUN than Earth? 3. Which two planets are nearly the exact same size (diameter)?

The Solar System Song /watch?v=pUZ2tfr1bsU 7 minutes

Is Pluto a Planet? Let’s analyze some data and decide for ourselves!

Sort all them planets, asteroids and other celestial bodies into categories. Then decide if Pluto resembles a PLANET, or if it more like another Celestial Body. watch?v=Z_2gbGXzFbs