1 Read each slide then use the red or some underlined words to complete the organizer. 1B
2 Did it start as a bang! 1B
3 The Expanding Universe A. The Big Bang Theory: Idea that all matter began in an infinitely small point and exploded out in all directions 1B
4 Galaxies: Billions of stars, dust, and gas held together by gravity 1B
5 Let s start out big and work our way down UNIVERSE VIRGO SUPER CLUSTER LOCAL GROUP GALAXY: BILLIONS OF STARS, DUST AND GAS HELD TOGETHER BY GRAVITY 1B
7 Universe ALL space and everything that is in it. 1B
8 Supercluster Virgo 1B
10 Who knew? was an astronomer in the 1920s who gathered many pictures of galaxies noticed they all didn t look alike decided to classify them by the way they looked into 3 types E or Spiral S or Barred Spiral SB or 1B
11 Galaxies Galaxies are grouped together in clusters. The cluster the Milky Way belongs to is called the Local Group. Cluster of galaxies Three types of galaxies: 1B
12 Three types of galaxies: Elliptical Spiral Irregular The Hubble Tuning Fork
13 Where do we live? Earth s Galaxy and Others Galaxies are grouped together in clusters. Cluster of galaxies The cluster the Milky Way belongs to is called the Local Group.
14 Spiral Galaxies Spiral Galaxies: Circular galaxies that have arms curve outward from a central hub. Two spiral galaxies!! Arms are made up of stars and dust
15 Illustration/draw and label:
16 halo disk bulge Spiral Galaxy
17 Elliptical Galaxies Most common type of galaxy; large three-dimensional football shaped galaxies. -Contain mostly older and dimmer stars. Vary in shape from completely round to extremely elongated ovals. Unlike spiral galaxies No bright nucleus at their center. Elliptical galaxies are represented by the letter E Divided into seven subgroups according to their shape. These subgroups are labeled E0 to E7. E0 galaxies nearly circular in shape while E7 galaxies are extremely elongated or stretched out.
18 Illustrate / Draw Elliptical
19 Irregular Galaxies Come in many different shapes and are smaller and less common Irregular Galaxies - No regular shape, includes nebulas, with no central bulge or spiral arms.
20 Illustrate/ Draw:
21 Earth s Galaxy Galaxy: A large group of stars, gas, and dust held together by gravity. Milky Way: Our galaxy which contains about 200 billion stars and many nebulas Spiral Galaxies
22 The Milky Way Galaxy The Milky Way is the galaxy that contains our Solar System which is just one of the several galaxies of the universe.. This name derives from its appearance as a dim "milky" glowing band arching across the night sky, in which the naked eye cannot distinguish individual stars. 100,000 light years in diameter Our sun orbits the center of the galaxy once every 240 million years A barred spiral galaxy Contains over 200 billion stars Its where we live!!!!!
23 Solar System Our star (Sun), the planets, many moons, and other small bodies that ALL travel around the Sun
24 Solar System
25 What do we see in the sky? The stars move in the sky but not with respect to each other The planets (or wanderers ) move differently from stars They move with respect to the stars They exhibit strange retrograde motion What does all this mean? How can we explain these movements? What does the universe look like? 1B
26 The Great Debate! Heraclides (330 B.C.) developed the first Solar System model, beginning of the geocentric versus heliocentric debate 1B
27 Timeline Galileo Newton Copernicus Tycho Kepler B
28 Geocentric (Ptolemaic) System The theory (in Greek, geo means earth), which maintained that Earth was the center of the universe, usually referring to the system of Claudius Ptolemy. 1B
29 Geocentric (Ptolemaic) System The accepted model for 1400 years The earth is at the center The Sun, stars, and planets on their spheres revolve around the earth: explains daily movement 1B
30 Geocentric (Ptolemaic) System cont To account for unusual planetary motion epicycles were introduced Fit the Greek model of heavenly perfection spheres are the perfect shape, circular the perfect motion 1B
31 Illustrate/ Draw model: 1B
32 Heliocentric (Copernican) System The word "helios" in Greek means "sun." Heliocentric means that the sun is at the center. A heliocentric system is one in which the planets revolve around a fixed sun. 1B
33 Helio- continued Thus Mercury, Venus, the Earth, Mars, Jupiter and Saturn all revolve around the sun. The moon is the only celestial sphere in this system which revolves around the earth, and, together with it, around the sun. 1B
34 Heliocentric (Copernican) System Sun at center (heliocentric) Uniform, circular motion No epicycles (almost) Moon orbited the earth, the earth orbited the sun as another planet 1B
35 Heliocentric (Copernican) System Planets and stars still on fixed spheres, stars don t move The daily motion of the stars results from the Earth s spin The annual motion of the stars results from the Earth s orbit 1B
36 Please Illustrate/ Pick one! 1B
37 Our Solar System Our solar system is made up of: Sun Nine planets Their moons Asteroids Comets Meteoros
38 Inner Planets The inner four rocky / Terrestrial planets. These planets have hard rock crusts, and dense rock and metal cores are: Mercury Venus Earth Mars
39 Mercury Mercury is the closest planet to the Sun. Mercury rotates the Sun in only 88 days. Mercury rotates very slowly on its axis with one day taking 58 Earth days. Mercury barely has any atmosphere, but does have glaciers. Called a morning star. This is because Mercury shines brightly in the early morning just before the sun rises. It has also been called an evening star for the same reason. Mercury is often visible for a brief period of time just after the Sun sets. 1B
40 Venus Sister planet to Earth Size and structure is VERY similar to Earth, often called "Earth's Twin" Has no moons or rings Hot, thick atmosphere Brightest object in sky besides sun and moon (looks like bright star) Covered with craters, volcanoes, and mountains
41 Earth Third planet from sun Only planet known to have life and liquid water Atmosphere composed of composed of Nitrogen (78%), Oxygen (21%), and other gases (1%).
42 Mars Fourth planet from sun Appears as bright reddish color in the night sky Called "the Red Planet" because it surface is covered with iron oxide- RUST! Proves that Mars once had free oxygen molecules in its atmosphere. Surface features volcanoes and huge dust storms Has 2 moons: Phobos and Deimos
43 Outer Planets A gas giant (sometimes also known as a jovian planet after the planet Jupiter, or giant planet) is a massive planet with a thick atmosphere of hydrogen and helium Jupiter Saturn Uranus Neptune
44 Jupiter Largest planet in solar system Brightest planet in sky 60+ moons, 5 visible from Earth Strong magnetic field Giant red spot Rings have 3 parts: Halo Ring, Main Ring, Gossamer Ring
45 Saturn 6 th planet from sun Seven thin, flat rings not solid but made up of particles of ice, dust and rocks 31 moons Largest moon, Titan, Easily visible in the night sky A lightweight planet and it spins so fast Voyager explored Saturn and its rings.
46 Uranus 7 th planet from sun Has a faint ring system 27 known moons Covered with clouds Sits and spins on its side with the north and south poles sticking out the sides.
47 Neptune 8 th planet from sun Discovered through math 7 known moons Triton largest moon Storm called the "Great Dark Spot" because it appears as a dark oval shape on the surface of the planet. Great Dark Spot thought to be a hole, similar to the hole in the ozone layer on Earth
48 Pluto our dwarf Pluto, the outermost planet, is a small, icy "dwarf planet it is smaller than the Earth's Moon.
49 Pluto 9 th planet from sun (usually) Never visited by spacecraft Orbits very slowly Moon, Charon, is very close to Pluto and about the same size
50 Comet- chunks of ice and dust Has an elliptical orbit around Sun Has a head (nucleus and coma) and tail. Tail always points away from sun.
51 Comets: Orbit
52 Asteroids- Larger chunks of rock Vary in size and shape In Asteroid Belt between Mars and Jupiter Revolve around sun in 3-6 years
53 Asteroids: Illustrate /draw
54 Meteoroids- smaller chunks of rock and dust in space. 1. randomly move about space ; no specific orbit 2. come from remains of comets and asteroids Meteor- a meteoroid that burns in the atmosphere- produces a streak of light. nickname: Shooting star MeteoriTe- a meteoroid that doesn t burn up in the Earth s atmosphere. It Touches Earth.
Chapter 23 Our Solar System Our Solar System 1 Historical Astronomy Wandering Stars Greeks watched the stars move across the sky and noticed five stars that wandered around and did not follow the paths
Unit 2 Lesson 1 What Objects Are Part of the Solar System? Florida Benchmarks SC.5.E.5.2 Recognize the major common characteristics of all planets and compare/contrast the properties of inner and outer
Chapter 23 Our Solar System Our Solar System Historical Astronomy Wandering Stars Greeks watched the stars move across the sky and noticed five stars that wandered around and did not follow the paths of
CORNELL NOTES Directions: You must create a minimum of 5 questions in this column per page (average). Use these to study your notes and prepare for tests and quizzes. Notes will be turned in to your teacher
Unit 12 Lesson 1 What Objects Are Part of the Solar System? The Solar System Earth, other planets, and the moon are part of a solar system. A solar system is made up of a star and the planets and other
Celestial bodies are all of the natural objects in space ex. stars moons, planets, comets etc. Star: celestial body of hot gas that gives off light and heat the closest star to earth is the sun Planet:
The Universe and Galaxies 16.1 http://dingo.care-mail.com/cards/flash/5409/galaxy.swf Universe The sum of all matter and energy that exists, that has ever existed, and that will ever exist. We will focus
Our Solar system Motion of the planets Our solar system is made up of the sun and the 9 planets that revolve around the sun Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune & Pluto (maybe?)
FCAT Review Space Science The Law of Universal Gravitation The law of universal gravitation states that ALL matter in the universe attracts each other. Gravity is greatly impacted by both mass and distance
Name: Date: Period: Chapter 3 The Solar System Section 1 Observing the Solar System (pp. 72-77) Key Concepts What are the geocentric and heliocentric systems? How did Copernicus, Galileo, and Kepler contribute
Chapter 9 Section 1: Our Solar System Solar System: The solar system includes the sun, planets and many smaller structures. A planet and its moon(s) make up smaller systems in the solar system. Scientist
ASTRONOMY Universe- Includes all known matter (everything). Celestial Object Any object outside or above Earth s atmosphere. Galaxy- A large group (billions) of stars (held together by gravity). Our galaxy
NAME: Period: asteroid asteroid belt comet ellipse force Galilean moons gas giants Chapter 16 Astronomy Study Guide VOCABULARY WORDS TO KNOW geocentric system meteorite gravity meteoroid greenhouse effect
Notes Astronomy What is the solar system? 11.1 Structure of the Solar System Our solar system includes planets and dwarf planets, their moons, a star called the Sun, asteroids and comets. Planets, dwarf
9.2 - Our Solar System Scientists describe our solar system as the Sun and all the planets and other celestial objects, such as moons, comets, and asteroids, that are held by the Sun s gravity and orbit
The Solar System Chapter 29 The Solar System Section 29.1 Models of the Solar System 29.1 notes Models of the Solar System Geocentric: : Earth-centered model of the solar system. (Everything revolves around
1UNIT The Universe What do you remember? What are the points of light in this photo? What is the difference between a star and a planet? a moon and a comet? Content objectives In this unit, you will Learn
Solar System Your task for each planet... Slide 1: What type of planet is it? (either rocky terrestrial world, gas giant or ice giant) What is it made of? Does it have any moons? What is its mass relative
Notes: The Solar System The Formation of the Solar System 1. A gas cloud collapses under the influence of gravity. 2. Solids condense at the center, forming a protostar. 3. A falttened disk of matter surrounds
Chapter Project Worksheet 1 Distance From Sun 1:10,000,000,000 Scale: Sun Center; Mercury 5.8 m; Venus 10.8 m; Earth 15.0 m; Mars 22.8 m; Jupiter 77.9 m; Saturn 143.4 m; Uranus 287.3 m; Neptune 449.5 m;
Astronomy Notes LESSON 1 Solar System 11.1 Structure of the Solar System axis of rotation period of rotation period of revolution ellipse astronomical unit What is the solar system? 11.1 Structure of the
Earth Science Chapter 20: Observing the Solar System Match the observations or discoveries with the correct scientist. Answers may be used more than once. Answers that cannot be read will be counted as
The Solar System Chapter Test A Multiple Choice Write the letter of the correct answer on the line at the left. 1. 2. 3. 4. 5. The fact that each planet s orbit is an ellipse was discovered by a. Copernicus.
Ag Earth Science Chapter 23 Chapter 23.1 Vocabulary Any of the Earth- like planets, including Mercury, Venus, and Earth terrestrial planet Jovian planet The Jupiter- like planets: Jupiter, Saturn, Uranus,
What is Earth Science? A.EARTH SCIENCE: the study of Earth and its history B. Earth science is divided into 4 main branches: 1. Geology: study of the lithosphere 2. Oceanography: study of oceans 3. Meteorology:
Section 1: The Universe 1. Cosmology is the study of. 2. Identify the type of cosmology a. The sun is the center of the Universe b. The Earth is the center of the Universe 3. The two most abundant gases
Edmonds Community College ASTRONOMY 100 Sample Test #2 Fall Quarter 2006 Instructor: L. M. Khandro 10/19/06 Please Note: the following test derives from a course and text that covers the entire topic of
Unit 1: The Earth in the Universe 1. The Universe 1.1. First ideas about the Universe 1.2. Components and origin 1.3. Sizes and distances 2. The Solar System 3. The planet Earth 3.1. Movements of the Earth
What Objects Are Part of the Solar System? Lesson 1 Quiz Josleen divided some of the planets into two main groups. The table below shows how she grouped them. Paul created a poster showing the solar system.
Solar System revised.notebook The Solar System Solar Nebula Theory Solar Nebula was a rotating disk of dust and gas w/ a dense center dense center eventually becomes the sun start to condense b/c of gravity
Key Points of Chapter 13 HNRS 227 Fall 2006 Chapter 13 The Solar System presented by Prof. Geller 24 October 2006 Planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune Dwarf Planets Pluto,
Ch 16.1-6: The Solar System Hmwk: M: a- I, k- q, s, t, w & x; MC: 1, 5-15; SA: 2, 3, 5-20. Astronomy the scientific study of the universe beyond Earth s atmosphere Universe everything, all energy, matter,
Sun Mercury Venus Earth Mars Jupiter Venus is the hottest planet in our solar system. The thick clouds on Venus hold the heat in. The sun s lights reflect off Venus s clouds making it look like the brightest
Regents Earth Science Unit 5: Astronomy Models of the Universe Earliest models of the universe were based on the idea that the Sun, Moon, and planets all orbit the Earth models needed to explain how the
Our Planetary System Chapter 7 Key Concepts for Chapter 7 and 8 Inventory of the Solar System Origin of the Solar System What does the Solar System consist of? The Sun: It has 99.85% of the mass of the
Earth Science 11 Learning Guide Unit 2 Name: 2-1 The sun 1. Complete the following table with information about the sun: a. Mass compare to the Earth: b. Temperature of the gases: c. The light and heat
The Solar System Review Choose the best response. Write the letter of that choice in the space provided. 1. Ptolemy modified Aristotle s model of the universe to include a. Oort clouds. b. retrograde motion.
Chapter 23: Touring Our Solar System The Sun The is the center of our solar system. The Sun makes up of all the mass of our solar system. The Sun s force holds the planets in their orbits around the Sun.
CHAPTER 16 4 Moons SECTION Our Solar System California Science Standards 8.2.g, 8.4.d, 8.4.e BEFORE YOU READ After you read this section, you should be able to answer these questions: How did Earth s moon
SOLAR SYSTEM NOTES ENERGY TRANSFERS Radiation - a process in which energy travels through vacuum (without a medium) Conduction a process in which energy travels through a medium Convection - The transfer
Introduction to Astronomy Have you ever wondered what is out there in space besides Earth? As you see the stars and moon, many questions come up with the universe, possibility of living on another planet
Cosmology Vocabulary Vocabulary Words Terrestrial Planets The Sun Gravity Galaxy Lightyear Axis Comets Kuiper Belt Oort Cloud Meteors AU Nebula Solar System Cosmology Universe Coalescence Jovian Planets
11 Video Script: 1. For thousands of years people have looked up at the night sky pondering the limits of our solar system. 2. Perhaps you too, have looked up at the evening stars and planets, and wondered
Joy of Science Experience the evolution of the Universe, Earth and Life Review Introduction Main contents Quiz Unless otherwise noted, all pictures are taken from wikipedia.org Review 1 The presence of
Vocabulary STUDENT RESOURCE 1.1 INFORMATION SHEET asteroids thousands of rocky objects that orbit the Sun Most asteroids orbit in a belt between the orbits of Mars and Jupiter. More than 9, asteroids have
SOLAR SYSTEM NOTES Our Solar System is composed of: 1. The Sun 2. The Planets 3. Asteroids 4. Comets 5. Meteors 6. Natural & Artificial satellites Remember: How old is our Solar System? Scientists believe
23.1 The Solar System Orbits of the Planets The Planets: An Overview The terrestrial planets are planets that are small and rocky Mercury, Venus, Earth, and Mars. The Jovian planets are the huge gas giants
The Solar System Presented By; Rahul Chaturvedi What s in Our Solar System? Our Solar System consists of a central star (the Sun), the eight planets and their satellites (or moon), thousand of other smaller
Earth & Space Science ~ The Solar System In e r Sci Uni 11 I. Sun, Earth & Moon A. The Solar System 1. the sun & the objects orbiting it a. incl. 8 planets, other stars, asteroids, meteoroids, dwarf planets,
The Earth in the Univers e The Earth in the Universe Geology The origin of the Universe The position of the Earth in the Universe Distances in the Universe Galaxies The Milky Way Stars: The Sun The Solar
Astronomy Study Guide Answer Key Section 1: The Universe 1. Cosmology is the study of how the universe is arranged. 2. Identify the type of cosmology a. The sun is the center of the Universe Heliocentric
Space Test Review Unit Test on Thursday April 17 True/False 1. A(n) asteroid is a massive collection of gases in space that emits large amounts of energy. 2. A(n) moon is a large, round celestial object
DATE DUE: Name: Ms. Terry J. Boroughs Geology 305 Section: Evolution of the Solar System Instructions: Read each question carefully before selecting the BEST answer or option. Use GEOLOGIC vocabulary where
Prentice Hall EARTH SCIENCE Tarbuck Lutgens Chapter 23 Touring Our Solar System 23.1 The Solar System The Planets: An Overview The terrestrial planets are planets that are small and rocky Mercury, Venus,
Our Solar System and Its Place in the Universe The Formation of the Solar System Our Solar System includes: Planets Dwarf Planets Moons Small Solar System bodies Sun Outer portion created Planets and their
Write the term that matches each definition: Chapter 2 Study Guide Terms: gas giants solar system moons satellite geocentric model trajectory Big Bang Theory diameter dense heliocentric model theory terrestrial
Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune 40.329407-74.667345 Sun Mercury Length of rotation Temperature at surface 8 official planets large number of smaller objects including Pluto, asteroids,
The Planets What s in Our Solar System? Our Solar System consists of a central star (the Sun), the main eight planets orbiting the sun, the dwarf planets, moons, asteroids, comets, meteors, interplanetary
Table of Contents Chapter: The Solar System Section 1: Planet Motion Section 2: The Inner Planets Section 3: The Outer Planets Section 4: Life in the Solar System 1 Planet Motion Models of the Solar System
UNIT 1: EARTH AND THE SOLAR SYSTEM. 1) A BRIEF HISTORY Theories of the Universe In the second century BC, the astronomer Ptolemy proposed that the Earth was the centre of the Universe, and that the Sun,
TEACHER BACKGROUND INFORMATION (The Universe) A. THE UNIVERSE: The universe encompasses all matter in existence. According to the Big Bang Theory, the universe was formed 10-20 billion years ago from a
When a planets orbit around the Sun looks like an oval, it s called a(n) - ellipse - circle - axis - rotation Which of the following planets are all made up of gas? - Venus, Mars, Saturn and Pluto - Jupiter,
Chapter 15 & 16 Science Review (PATTERNS IN THE SKY, OUR SOLAR SYSTEM) The Milky Way the galaxy that contains our solar system Our solar system is a speck in the Milky Way galaxy Pluto is now considered
UNIT 1: THE UNIVERSE VOCABULARY Asteroids Asteroid belt Astronomical unit (AU) Black hole Celestial body Cluster of galaxies Comets Constellation Dwarf planets Galaxy Light-year (LY) meteorites Milky Way
Prentice Hall EARTH SCIENCE Tarbuck Lutgens 23.1 The Solar System The Planets: An Overview The terrestrial planets are planets that are small and rocky Mercury, Venus, Earth, and Mars. The Jovian planets
Learning About Our Solar System By debbie Routh COPYRIGHT 2004 Mark Twain Media, Inc. ISBN 978-1-58037-876-5 Printing No. 404007-EB Mark Twain Media, Inc., Publishers Distributed by Carson-Dellosa Publishing
Solar System Test Review There are several planets in the solar system. What do all of these planets have in common? A.They all orbit the Sun. B. They are all close to the Moon. C.They are all called Earth.
Inner and Outer Planets Inner Planets Terrestrial planets are those that are closest to the Sun. Terrestrial planets are made mostly of rock and have similar characteristics to Earth. There are four terrestrial
The Solar System TABLE OF CONTENTS click one to go to that page, or just go on. What is the Solar System? The Sun Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune (Pluto) Asteroids Meteors and Meteorites
ASTRONOMY SNAP GAME with interesting facts Sun Sun The Sun is the largest object in the solar system The Sun's life expectancy is approximately 5 billion more years At its core, the Sun s temperature is
Inner and Outer Planets SPI 0607.6.2 Explain how the relative distance of objects from the earth affects how they appear. Inner Planets Terrestrial planets are those that are closest to the Sun. Terrestrial
CHAPTER 11 We continue to Learn a lot about the Solar System by using Space Exploration Section 11.1 The Sun page 390 -Average sized star -Millions of km away -300,000 more massive then Earth, 99% of all
Chapter 4 - Group Homework Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Density is defined as A) mass times weight. B) mass per unit volume.
Unit 2 Lesson 1 LESSON topic: formation of the solar system - Solar system formation - Star formation - Models of the solar system - Planets in our solar system Big bang theory Origin of the universe According
Unit 6 Lesson 4 What Are the Planets in Our Solar System? What other objects are near Earth in this part of space? Earth and millions of other objects make up our solar system. In Our Corner of Space A
Vocabulary: Match the vocabulary terms on the left with the definitions on the right 1. Galaxy (a) the length of a planet s day 2. Rotational Period (b) dust and gases floating in space 3. Orbital Period
What is the Solar System? Our Solar System is one of many planetary systems. It consists of: The Sun Eight planets with their natural satellites Five dwarf planets Billions of asteroids, comets and meteors
ASTRONOMY NOTES CHAPTER 3: THE SOLAR SYSTEM LESSON 1: MODELS OF THE SOLAR SYSTEM GEOCENTRIC MODEL = Earth is at the center of the revolving planets & stars 1. Early observers thought Earth was at center
The Outer Planets (pages 720 727) Gas Giants and Pluto (page 721) Key Concept: The first four outer planets Jupiter, Saturn, Uranus, and Neptune are much larger and more massive than Earth, and they do
----------------------------- ---------- ------ Section 1 Review CVtpf 2-1 -- SECTION VOCABULARY planet a celestial body that orbits the sun, is round because of its own gravity, and has cleared the neighborhood
4. THE SOLAR SYSTEM 1.1. THE SUN The sun is the star located in the center of the solar system. The sun is a yellow star, since its superficial temperature is about 5.500 C (although, the temperature can
The Inner Planets Chapter 3 Lesson 1 Pages 152-159 Workbook pages 51-52 Create the Foldable on pg 159 The solar The planets system The four inner planets Compare and Contrast Question What are planets?
Name Test Date Hour Astronomy#3 - Notebook The Solar System LEARNING TARGETS I can describe the objects that make up our solar system. I can identify the inner and outer planets. I can explain the difference
The Solar System Sun Center of the solar system About 150,000,000 km from the Earth An averaged sized, yellow star Spherical in shape due to gravity Made of about ¾ hydrogen and ¼ helium, both of which
Name Vocabulary Fill in the blank with the term that best completes the sentence., 6.11B 1 is the process in which energy is released as the nuclei of small atoms combine to form a larger nucleus., 6.11B
Lesson 4 Dwarf Planets and Other Objects LA.22.214.171.124, SC.8.E.5.1, SC.8.E.5.3, SC.8.E.5.7, SC.8.N.3.1 Skim or scan the heading, boldfaced words, and pictures in the lesson. Identify or predict three facts
Exploring Our Solar System Our Solar System What do you think? Read the two statements below and decide whether you agree or disagree with them. Place an A in the Before column if you agree with the statement