1 EXPLORE! A Cooperative Project of the Lunar and Planetary Institute, NASA's Office of Space Science and public libraries Activity: Solar System: The Scale of the Solar System Level: Grades 5-8 To Take Home: Drawing of the Solar System Background Information The Solar System The solar system began when gravity caused a cloud of dust and gas (mostly hydrogen) to condense about 5 billion years ago. The cloud was spinning, and this prevented all the material from falling in toward the center. It formed a rotating disk that flattened into a plane (called the ecliptic ). Ninety-nine percent of the mass of the solar system was hydrogen and helium, while the remaining 1% was dust. The disk had a central bulge of material that condensed rapidly and heated up to a point where fusion began to occur. Thus was formed the central star of the solar system, our Sun. Dust and gas particles continued to swirl around the Sun, which was now blowing out its solar wind in all directions. These dust particles began to join together and coalesce into larger fragments after about 10 million years. This process, known as accretion, formed the planets. Inner planets condensed with less gas because the solar wind combined with the heat of the Sun and became the inner terrestrial or rocky planets: Mercury, Venus, Earth, and Mars. The cooler outer regions of the solar system allowed the evolution of the gaseous planets: Jupiter, Saturn, Uranus, and Neptune. At a sufficient distance from the Sun, it is cold enough for ice to form in the disk, and the presence of ice allows more solid material to be available for planet building. The giant planets began with large cores of rock and ice and then swept up large amounts of gas to form thick atmospheres. Pluto, a tiny icy planet, is most likely a large member of the family of objects left over from the origin of the solar system that lie beyond the orbit of Neptune and contain comets.
2 Evidence of impacts occurring over millions of years can be seen in the cratered surfaces of the rocky planets and moons. Although much of this material has thinned out, there is still a great quantity of small debris that orbits the Sun and rains down on the planets in the form of meteors. Much of this material is the debris left by comets as they orbit the Sun, melt, and disintegrate. The seasonal meteor showers on Earth are actually composed of comet debris that the Earth passes through in its orbit around the Sun. The Inner Planets Mercury is a small rocky planet with no atmosphere. It is similar in size and appearance to our Moon. It is extremely hot and has a rotation (day) that is nearly as long as its orbital period (year) because of the Sun s strong gravitational pull. Venus has a thick atmosphere composed of carbon dioxide and sulfuric acid, which causes a severe greenhouse effect. It has many active volcanos and a surface temperature of over 900 Fahrenheit. Earth, located at a good distance from the Sun and fairly large, was able to maintain its rich atmosphere and oceans of water and developed life over millions of years. The many impact craters that were formed on Earth (as well as the other planets) are mostly invisible now because of erosion by water, weather, volcanism, and tectonics. Mars has a very thin atmosphere consisting primarily of carbon dioxide and has very cold temperatures, as low as 125 Celsius ( 190 Fahrenheit). Mars used to have a thicker, warmer atmosphere and probably running water, as evidenced by many former river beds, but the atmosphere is now much thinner, and its temperature is too low to support liquid water. Two ice caps at each pole contain frozen carbon dioxide and some water. Recently there has been new evidence (from possible fossils contained in meteorites thought to have come from Mars) that primitive bacterial life may have once existed on this planet. The Outer Planets The outer planets Jupiter, Saturn, Uranus, and Neptune are all gas giants with cores composed of ice and rock that formed in the cooler outer regions of the solar system. Jupiter, Saturn, Uranus, and Neptune have large amounts of hydrogen, the major element of the solar system. Uranus is tipped on its side with respect to its ecliptic path about the Sun, possibly due to an impact early in its formation. All the outer gaseous planets have ring systems or parts of ring systems. These have evolved in the past 100 to 200 million years from material created from moons and moonlets (tiny moons) impacting each other. Pluto is made of mostly rock and ice and is generally thought to be the largest member of the outer region of objects that lie beyond Neptune and include comets called Kuiper Belt objects. All the major planets travel along the plane of the ecliptic except for the inclined plane of Pluto s orbit. Pluto crosses inside Neptune s orbit for a short period during each orbit around the Sun.
3 Moons The moons of Mars are very small and are most likely captured asteroids from the asteroid belt (material that never coalesced into a planet because of the immense gravity of Jupiter). Earth s Moon was most likely formed when a large chunk of planetary material (about the size of Mars) impacted into Earth during its formative years. This hurled a large amount of material into orbit around Earth, which eventually coalesced into the Moon. The moons of the outer planets probably formed at the same time as the planets themselves out of material trapped by the gravitational pull of that planet. The moon systems of the large planets are quite like smaller versions of the solar system. The moons of the giant planets are made up of rock and ice, some with small iron cores. Saturn s moon Titan has a thick atmosphere composed of nitrogen and methane and may be covered with an ocean of ethane or methane. Jupiter s moon Europa may harbor a liquid water ocean under its cracked icy surface. Another of Jupiter s moons, Io, has volcanos that are more active than any volcano on Earth. The largest moons of Jupiter and Saturn are larger than the planets Mercury and Pluto. Pluto s moon, Charon, is about half the size of Pluto. Comets Outside Neptune lies a region filled with debris left over from the formation of the solar system. This very cold region is composed mainly of comets made up of rock and ice. As the solar system orbits the center of our Milky Way galaxy, it passes nearby stars, which cause gravitational disturbances and knock comets in toward the Sun or out of the solar system. Comets that travel in toward the Sun always have their tails pointing away from the Sun due to the solar wind. Sometimes comets are maneuvered by the gravitational pull of planets into different orbits around the Sun or around a planet. This happened in 1994 when Comet Shoemaker-Levy was captured by Jupiter's gravity, broke apart, and eventually impacted the surface of the planet. Asteroids The asteroid belt, or region between Mars and Jupiter, is composed of thousands of catalogued asteroids (there are probably thousands more). Mostly rock, this material was never able to coalesce into a planet because of the massive gravity of Jupiter. Most asteroids are quite small; the largest known asteroid, Ceres, has a diameter of only 623 miles. The Size of the Solar System The scale of the sizes of the planets is one that is fairly easy to impart to students. A circle that is 36 feet in diameter can represent the Sun, and the paper cutouts (sizes given below) can be used to identify the planets. But at that scale, you cannot show the distances between the planets. The solar system is mostly just space! The distances are so large that you must use very small balls and grains of sand to represent the distances at a scale where you need to walk only four or five blocks to Pluto. By the time you reach the outer planets and look back at the Sun, it is merely a tiny speck in the sky.
4 The idea that the planets also are not lined up, like in this demonstration but spread out in their orbits, dramatizes the amount of space in the solar system. When you reach Pluto and discuss the location of the nearest star, most guesses will be within your state or town. The truth is, at this scale, the nearest star is about 2,000 miles away! Practice the scale activity first yourself so you know you have enough walking distance. If you are able, you can have the students walk all the way from the starting point to Pluto. You can also drive the distances beforehand, marking the distances to each planet. Activity Timeframe - 90 minutes The Scale of the Solar System Materials Book or video about the size of the solar system Paper, pencils Colored markers Sticks with scale balls representing the planets Sticks with tags with the names of the nine planets, the Moon, the Sun, and the asteroid belt Use Styrofoam balls, marbles, and grains of sand (see the Handout Chart) for the planets on the top of each stick Copies of the two Student Handouts: Planet Facts and Scale of the Solar System. Cut out the planets out of paper. Sizes are: Mercury 4 centimeters or 1 ½ inches Venus 10 centimeters or 4 inches Earth 10 centimeters or 4 inches Moon 3 centimeters or 1 ¼ inches Jupiter 113 centimeters or 45 inches Saturn 94 centimeters or 37 ½ inches Uranus 41 centimeters or 16 ½ inches Neptune 39 centimeters or 16 inches Pluto 2 centimeters or ¾ inch Introduction to the Size of the Solar System You may choose to read a short story to the group about the solar system to begin the session. For example, a picture book, such as The Magic School Bus: Lost in the Solar System or My Place in Space. Give students the handouts included in this guide.
5 You can also show a short video (or part of a video) to the group about the solar system (see book and video lists). Timeframe minutes. The Solar System Introduce or review the major components of the solar system: planets, moons, asteroids, and comets. As a group, brainstorm the answers to some general questions about the solar system. What do all of the planets revolve around? Why? All of the planets revolve around the Sun because it is so large and has gravitational influence over them. Which planets are hot? Which are cold? Why? The inner planets are warmer and the outer planets are colder because of their distance from the Sun. What lies between the planets? Between the planets lie mostly space, some comet debris, the asteroids, the solar wind, cosmic radiation, and a few human spacecraft. What revolves around some planets? Why? Moons and rings orbit many of the planets. The local gravitational pull of the planet outweighs the gravitational pull of the Sun (although each planet/moon/ring system orbits the Sun). Why do planets have rings? Material resulting from moons impacted by other moons and moonlets (tiny moons) has evolved into ring systems over the past one to two hundred millions years. Saturn s rings are the oldest; the rings of Jupiter, Uranus and Neptune are still evolving. How did the solar system form? The solar nebula formed from a cloud of gas and dust. Gravity pulled the gases in towards the center and formed the star. The material around the new star formed into planetesimals and finally into planets and moons. Why would your weight be different on different planets? Your weight is different on different planets because the gravitational pull is different due to planet size. Have the students draw the solar system as they know it. They can use the handouts to help guide them in the sizes of the planets. Have them use color. One easy way to remember the order of the planets is the phrase My Very Educated Mother Just Served Us Nine Pizzas. The Asteroid Belt lies between Mars and Jupiter. Comets live outside the solar system in two regions called the Kuiper Belt and the Oort Cloud. Due to perturbations in the solar system, occasionally comets fall into orbits around the sun. Timeframe minutes.
6 The Size of the Planets Show them the cutout planets. Have them identify each planet one at a time and put them in order. If you can, bring the students to a location where you can point out an approximate "size" of the Sun (36-foot diameter circle). Timeframe - 15 minutes. Procedure 1. Show the students the cutout planets in no particular order. Then ask, "Which planet might be Mercury?" "Jupiter?" (etc.) As they identify each of the planets, have them line them up in order (like in the photo above). 2. Ask them, "How big would Saturn s rings be at this scale?" At this scale Saturn's rings would be about half the diameter of the planet on each side. 3. Ask them, "How far away from one another would the planets have to be at this scale?" They would be very far apart, farther than we could show at this scale! Mercury at this scale would be 1,500 feet away from the Sun! Scale of the Solar System This activity allows the group to walk through the entire solar system to get an idea of the immense distances between the planets. Bring the students outside to the start of their journey through the solar system. Show them that you have scaled down all of the sizes from the preceding activity by a factor of 100. Now the size of the Sun is only about 4 inches across. This will allow you to walk to all of the planets at this scale. If you are limited by distance, you can walk the students to only Uranus and point out markers for Neptune and Pluto. Carry the table of distances and another star (5-inch globe or baseball) with you.
7 Have one student assigned to hold each planet s marker. Another student can mark the distance in yards (long strides) to that planet. Others can share some facts about that planet. Timeframe minutes. Procedures 1. Start by placing the Sun. Then walk the class to each of the planets and mark each with the flag or marker as you get there. 2. Note the size of the ball or grain of sand representing that planet. Some of the information in the table, such as the time it takes light or radio waves to travel from the Sun to each planet, helps to emphasize the large distances. 3. One way to envision the large distances between planets is by noting the time it takes spacecraft to travel from Earth to each planet. The precise time varies, depending on the orbit of each spacecraft, but the values in the table show the travel times for some NASA planetary probes. 4. From each planet, look back at the "Sun" and imagine how large it appears in the sky. Also point out that as one travels to the outer solar system, the great distance from the Sun means that it is quite cold. Temperatures range from a scalding 380 C (715 F) on Mercury, to -70 C (-94 F) on Mars, -143 C (-225 F) at Jupiter, and a frigid -235 C (-390 F) at Neptune and Pluto.
8 Note: In marking the distances make sure you remember to start counting with the number where you left off at (i.e. count to 5 yards, then start at 5 till you reach 9 yards, etc.) Follow-Up Questions The nearest star to the solar system is Alpha Centauri. When you get to Pluto, ask your students "How far away do you think it would be to Alpha Centauri, the nearest star at this scale?" Most are likely to say no more than a few miles. Actually, at this scale, Alpha Centauri would be about 11 centimeters across and 3200 kilometers (2000 miles) away, roughly the distance from New Orleans to San Francisco. The brightest star in our sky is Sirius. At this scale it would be about 23 centimeters across and 6500 kilometers away (4000 miles), roughly the distance from New Orleans to Hawaii. For such small objects to be visible at such large distances, stars (including our Sun) clearly must radiate a great deal of energy. If there is time, students can calculate their weight on different planets using the handout giving the surface gravity on each planet. Recommended Videos NASA (CORE) Catalog: To order by Solar System Exploration Videotape Collection $24.00,Grades 8-12, 75 minutes,1992 Ten segments highlighting the Voyager, Magellan, Galileo and Ulysses missions to the planets. The New Solar System $25.00, 60 Minutes, 1994, Finley-Holiday Films (800) Enhanced visuals of planetary features from Mercury to Neptune. On Robot Wings - A Flight Through the Solar System $25.00, 30 minutes, 1992, Finley-Holiday Film Corp., (800) Other Video Resources The Great Solar System Rescue Small groups of students make up teams of experts (astronomers, meteorologists, geologists and space historians) searching for lost probes in our solar system. Armed with a packet of material, students must work together analyzing visual data from the video to form theories about each probe's location. Also includes a refresher in planetary basics to theory-building exercises to a selection of cross-cultural views of the heavens.
9 Our Solar System - The Inner Planets Earth's neighbors are revealed with animations and NASA photos as the "Assistant Professor" takes the viewer on a guided tour of Mercury, Venus, Earth, the Moon, and Mars. Our Solar System - The Outer Planets Close-up photographic and animated views of the giant outer planets of our solar system illustrate their surprising composition and vital statistics. What's Out There? Exploring the Solar System Explore the solar system starting with various early ideas about the universe to the dawning of the space age. This video supports the fact that our knowledge and understanding of the mysterious solar system is constantly being broadened and updated. Grades 4-6 Books you can borrow from your library Non-fiction Simon, Seymour. Our Solar System. William Morrow & Company ISBN: Dickinson, Terence. Other Worlds: A Beginner's Guide to Planets and Moons. Firefly Books ISBN: Riley, Peter D. Our Solar System. Readers Digest ISBN: Kerrod, Robin. The Children's Space Atlas: A Voyage of Discovery for Young Astronauts. Millbrook Press ISBN: X. Vogt, Gregory L. The Solar System: Facts and Exploration (Scientific American Sourcebooks). Twenty-First Century Books ISBN: Ride, Sally; O Shaughnessy, Tam. Voyager: An Adventure to the Edge of the Solar System (Face to Face With Science). Crown Publishers ISBN: Verba, Joan Marie. Voyager: Exploring the Outer Planets. Lerner Publications Company ISBN: Kelch, Joseph W. Small Worlds: Exploring the 60 Moons of Our Solar System. Julian Messner ISBN: Fiction Hirst, Robin; Hirst, Sally. My Place in Space. Orchard Books ISBN: Cole, Joanna; Degen, Bruce. The Magic School Bus Lost in the Solar System. Scholastic Trade ISBN:
10 Magazine StarDate Guide to the Solar System University of Texas at Austin, McDonald Observatory 2609 University Avenue #3.118, Austin, TX Phone: (512) Related Internet Sites: The Nine Planets Students for the education and development of space Views of the Solar System Our Solar System Origin of the Solar System (story and images) Origin of the Moon (story and images)
11 HANDOUT - PLANET FACTS AT A GLANCE PLANET MERCURY VENUS EARTH MARS JUPITER SATURN URANUS NEPTUNE PLUTO Distance from Sun (millions of miles) Period of Revolution (year)* Period of Rotation (day)* , days days days days retrograde Inclination of Axis (degrees) Inclination of Orbit to Ecliptic (degrees) Diameter (miles) Atmosphere None Carbon dioxide days 23 hrs. 56 min d ays 24 hrs. 37 min years 9 hrs. 56 min years 10 hrs. 40 min years years 17 hrs. 14 min. 16 hrs. 6 min years 6.39 days retrograde ,031 7,521 7,926 4,219 88,729 74,975 31,763 30,775 1,429 Nitrogen Oxygen Carbon dioxide Hydrogen Helium Hydrogen Helium Hydrogen Helium Methane Hydrogen Helium Methane Moons Rings , *Periods are given in Earth time YOUR WEIGHT ON OTHER WORLDS Multiply Your Weight by the Surface Gravity to get the result for the Last Column. For example, on Venus if you weighed 100 lbs, 100x.91=91lbs Planet Surface Gravity My Weight Mercury.18 Venus.91 Earth 1 Moon.6 Mars.38 Jupiter 2.54 Saturn 1.07 Uranus.87 Neptune 1.14 Pluto.07 Methane
12 HANDOUT - Planetary Scale If the Sun is the size of a baseball approximately54 in diameter, the sizes and distances of the planets are given in the chart below. Using this scale, you can mark the distances with flags beginning in your school gymnasium or athletic field and walking the distances to each planet. One very large stride can be measured as one yard. As you can see by this demonstration, most of space is just that, SPACE. At this scale, what city or place could you estimate for the nearest star? SCALE SIZE of PLANET REPRESENTATIVE OBJECT DISTANCE Light Time Spacecraft From Sun Trip SUN CENTER MERCURY GRAIN OF 15 (5 yd) 3.2 minutes 5 months VENUS GRAIN OF 28 (9 yd) 6 minutes 3 months EARTH GRAIN OF 38 (13 yd) 8.3 minutes MOON GRAIN OF SAND 1 from Earth 1.3 seconds 3 days from Earth MARS GRAIN OF 59 (20 yd) 12.7 minutes 8 months ASTEROIDS 99 (33 yd) 21 minutes 1 year JUPITER 3/8 200 (66 yd) 43 minutes 1.5 years SATURN 2/8 367 (122 yd) 1.3 hours 3.2 years SATURN S RINGS 2/3 Diameter Disk Around Planet URANUS 1/8 741 (247 yd) 2.7 hours 8.5 years NEPTUNE 1/ (348 yd) 4.2 hours 12 years PLUTO GRAIN OF 1520 (507 yd) 5.5 hours not yet visited NEAREST STAR = 10 ½
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Exercises 131 The Falling Apple (page 233) 1 Describe the legend of Newton s discovery that gravity extends throughout the universe According to legend, Newton saw an apple fall from a tree and realized
The orbit of Halley s Comet Given this information Orbital period = 76 yrs Aphelion distance = 35.3 AU Observed comet in 1682 and predicted return 1758 Questions: How close does HC approach the Sun? What
Bay Area Scientists in Schoos Presentation Plan Lesson Name 3 rd Grape from the Sun Presenter(s) Nicholas McConnell Grade Level 5 Standards Connection(s) The Solar System contains Earth, 7 other planets,
TO GO TO ANY OF THE PAGES LISTED BELOW, CLICK ON ITS TITLE CHAPTER 17 The Solar System 1 17-1 What is the solar system? 2 17-2 What do we know about orbits? 3 Comparing Planetary Revolutions Enrichment
Voyage: A Journey through our Solar System Grades 5-8 Lesson 1: Our Solar System On a visit to the National Mall in Washington, DC, one can see monuments of a nation Memorials to Lincoln, Jefferson, and
Vagabonds of the Solar System Chapter 17 ASTR 111 003 Fall 2006 Lecture 13 Nov. 27, 2006 Introduction To Modern Astronomy I Introducing Astronomy (chap. 1-6) Planets and Moons (chap. 7-17) Ch7: Comparative
WELCOME to Aurorae In the Solar System Aurorae in the Solar System Sponsoring Projects Galileo Europa Mission Jupiter System Data Analysis Program ACRIMSAT Supporting Projects Ulysses Project Outer Planets
Our Solar System!!! Solar System scaled to accurate size, not distance from the Sun. The Order of the Solar System Although not to scale, this diagram shows where all the objects in our Solar System are