# Chapter: The Solar System

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2 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

3 1 Planet Motion Models of the Solar System Geocentric Model In the geocentric model of the solar system, Earth is considered the center and everything else revolves around it.

4 1 Planet Motion Heliocentric Model Earth-centered model held until Nicholas Copernicus published a different view. Copernicus stated that the Moon revolves around Earth. Earth and the other planets revolve around the Sun.

5 1 Planet Motion Heliocentric Model The apparent motion of the planets, the stars, and the Sun is due to Earth s rotation. This is the heliocentric model, or Suncentered model of the solar system.

6 1 Planet Motion Heliocentric Model Galileo Galilei found evidence that supported the ideas of Copernicus. He observed that Venus went through phases like the Moon s. He also saw moons in orbit around Jupiter.

7 1 Planet Motion Understanding the Solar System In the early 1600 s, Kepler discovered that the planets travel around the Sun in ellipses, not circles. Planets travel at different speeds in their orbits. The astronomical unit (AU) equals the average distance from Earth to the Sun, about 150 million km.

8 1 Planet Motion Classifying Planets One system uses sizes and other characteristics. Those similar to Earth are called terrestrial planets, giant planets are jovian planets. Two other systems classify planets by location.

9 1 Planet Motion Classifying Planets Planets whose orbits are between the Sun and the asteroid belt as inner planets and those beyond the asteroid belt as outer planets. The other system classifies planets whose orbits are between Earth s orbit and the Sun as inferior planets, and those whose orbits are beyond Earth s orbit as superior planets.

10 1 Planet Motion Other Solar Systems Extrasolar planets planets in orbit around other stars are helping astronomers learn how planetary systems form. Astronomers have devised new techniques and instruments to find planets around other stars.

11 1 Question 1 Section Check Who was responsible for developing the geocentric model of the solar system? A. Aristotle B. Copernicus C. Galileo D. Ptolemy

12 1 Answer The answer is D. Ptolemy presented his geocentric model of the solar system in 140 A.D. Section Check

13 1 Question 2 Section Check Approximately how long is an astronomical unit? A. 100 km B. 100 million km C. 150 million km D. 200 billion km

14 1 Answer Section Check The answer is C. One astronomical unit equals the average distance from Earth to the Sun, about 150 million km.

15 1 Question 3 Section Check are planets in orbit around stars other than our Sun. A. Extrasolar planets B. Extrasensory planets C. Intersolar planets D. Intrasolar planets

16 1 Answer Section Check The answer is A. Scientists have discovered extrasolar planets around Upsilon Andromedae.

17 2 The Inner Planets Planets near the Sun The second-smallest and closest planet to the Sun is Mercury. Mercury is covered by craters. Mercury has a much larger iron core than would be expected and is missing some lighter materials.

18 2 The Inner Planets Planets near the Sun Mercury s large, solid core shrank much more rapidly than its thin outer layers. As the outer layers adjusted, they wrinkled, forming dramatic cliffs as high as 3 km. Mercury has no true atmosphere. Surface temperatures vary from 427ºC to -170ºC.

19 2 Venus The Inner Planets Venus is the second planet from the Sun. Venus is blanketed by a dense atmosphere.

20 2 Venus The Inner Planets Heat radiated from Venus s surface is absorbed by the carbon dioxide gas, causing what is called a greenhouse effect. Due to this intense greenhouse effect, temperatures on the surface of Venus are between 450ºC and 475ºC.

21 2 Earth The third planet from the Sun is Earth. Temperatures on Earth allow water to exist as a solid, a liquid, and a gas. Ozone in Earth s atmosphere protects life from the Sun s intense radiation. The Inner Planets

22 2 Mars Other Martian features are the polar ice caps and changes in the coloring of Mars s surface. The Inner Planets The fourth planet from the Sun, Mars, is called the red planet because of iron oxide in some of the weathered rocks.

23 2 Mars The Inner Planets The polar ice caps are made of frozen carbon dioxide and frozen water.

24 2 Mars The Inner Planets The Martian atmosphere is much thinner than Earth s and is composed mostly of carbon dioxide with some nitrogen and argon. Mars has two small, heavily cratered moons called Phobos and Deimos.

25 2 The Inner Planets NASA on Mars The Mariner 9 space probe orbited Mars in Valles Marineris is a large canyon that was discovered by this early mission. Mariner 9 also found large, extinct volcanoes.

26 2 The Inner Planets The Viking Probes In 1976, the Viking 1 and Viking 2 probes landed on Mars. The Viking 1 and Viking 2 orbiters photographed the entire surface of Mars from orbit. Landers conducted meteorological, chemical, and biological experiments on the planet s surface.

27 2 The Inner Planets Global Surveyor, Pathfinder, and Odyssey Global Surveyor showed that the walls of Valles Marineris have distinct layers similar to those of the Grand Canyon. Mars Odyssey, provided evidence for water as frost beneath a thin layer of soil in the far northern and southern parts of Mars.

28 2 The Inner Planets Global Surveyor, Pathfinder, and Odyssey The Mars Pathfinder and its rover, Sojourner, gathered data that indicated that iron in Mar s crust may have been leached out by groundwater.

29 2 Question 1 Section Check Which planet is closest to the Sun? A. Mars B. Mercury C. Earth D. Venus

30 2 Answer Section Check The answer is B. Mercury is the closest planet to the Sun. Venus is the second planet from the Sun.

31 2 Question 2 Section Check Which planet has size and mass similar to Earth s? A. Jupiter B. Mercury C. Pluto D. Venus

32 2 Answer Section Check The answer is D. Venus has similar size and mass but the temperatures on its surface are between 450º C and 475º C.

33 2 Question 3 Section Check Earth is the planet from the Sun. A. second B. third C. fourth D. fifth

34 2 Answer Section Check The answer is B. Mercury and Venus are closer to the Sun than Earth.

35 3 Jupiter The Outer Planets The largest and fifth planet from the Sun is Jupiter. It is composed mostly of hydrogen and helium.

36 3 Jupiter The Outer Planets Continuous storms of swirling, highpressure gas have been observed on Jupiter. The Great Red Spot is the most spectacular of these storms.

37 3 The Outer Planets Space Probes to Jupiter In 1979, Voyager1 and Voyager 2 flew past Jupiter, and the Galileo space probe reached Jupiter in The major discoveries of these probes include information about the composition and motion of Jupiter s atmosphere, characteristics of some of its moons and the discovery of new moons.

38 3 The Outer Planets Jupiter s Moons Four are large enough to be considered small planets. These Galilean moons of Jupiter are Io, Europa, Ganymede, and Callisto.

39 3 The Outer Planets Jupiter s Moons Ganymede is larger than the planet Mercury and is the largest moon in the solar system. Io is under a constant tug-of-war between the gravities of Jupiter and Europa. This heats up the interior of Io and causes it to be the most volcanically active body in the solar system.

40 3 Saturn The Outer Planets Saturn is the sixth planet from the Sun and is known as the ringed planet. Saturn is a large planet with a thick outer atmosphere composed mostly of hydrogen and helium with some ammonia, methane, and water vapor.

41 3 The Outer Planets Saturn s Rings Saturn s rings are composed of countless ice and rock particles ranging in size from a speck of dust to tens of meters across. Pictures of these rings showed a density wave and areas where the ring material bends up and down.

42 3 Uranus The Outer Planets Uranus, is the seventh planet from the Sun. It is a large planet with 27 moons. The atmosphere of Uranus contains hydrogen, helium, and about two percent methane. The methane gives the planet its blue-green color.

43 3 Neptune The Outer Planets Neptune, another large planet similar in size to Uranus, is the eighth planet from the Sun. Neptune s atmosphere is similar to that of Uranus, but has a little more methane about 3 percent causing it to look bluer.

44 3 Pluto The Outer Planets Pluto, is farther from the Sun than Neptune during most of its orbit, it is considered the ninth planet from the Sun.

45 3 The Outer Planets Comets and Other Objects A comet, is composed of dust rock particles mixed with frozen water, methane, and ammonia. As a comet approaches the Sun, it begins to vaporize. The released dust and gases form a bright cloud called a coma around the nucleus. The solar wind pushes on the vaporized coma, forming a tail that always points away from the Sun.

46 3 The Outer Planets Comets and Other Objects Most comets come from two places a vast disk of icy comets called the Kuiper Belt near Neptune s orbit and the Oort cloud. Once in orbit around the Sun, comets reappear at predictable times.

47 3 The Outer Planets Comets and Other Objects Rocky objects formed from material similar to that of the planets are called asteroids. Most asteroids are found in a belt between the orbits of Mars and Jupiter. Asteroids range in size from tiny particles to objects 940 km in diameter.

48 3 The Outer Planets Comets and Other Objects Other rocky objects orbiting within the solar system are meteoroids. Meteoroids may enter the atmosphere. Most burn up completely and we see them as meteors or shooting stars. Others do not burn completely and strike Earth. These are called meteorites.

49 3 The Outer Planets Comets and Other Objects Sedna has been labeled a distant planetoid and with a diameter of 1,200 to 1,700 km, it is smaller than Pluto, but larger than comets in the Kuiper Belt.

50 3 Question 1 Section Check The fifth planet from the Sun is. A. Jupiter B. Neptune C. Saturn D. Pluto

51 3 Answer Section Check The answer is A. Jupiter is the largest planet in the solar system.

52 3 Question 2 Section Check Which of Jupiter s large moons is closest to Jupiter and the most volcanically active object in the solar system? A. Callisto B. Europa C. Ganymede D. Io

53 3 Answer Section Check The answer is D. Jupiter exerts tremendous gravitational pull on Io.

54 3 Question 3 Section Check It takes Pluto to orbit the Sun one time. A. 2 years B. 24 years C. 124 years D. 248 years

55 3 Answer Section Check The answer is D. During part of its orbit, Pluto is closer to the Sun than Neptune, but is still considered to be the ninth planet from the Sun.

56 4 Life in the Solar System Life as We Know It Exotic Life on Earth A research submarine, the Alvin, found some interesting life-forms while exploring hot, volcanic vents on the ocean floor. Life-forms found included crabs, clams, and tubeworms. Alvin also discovered colonies of bacteria living off the extremely hot material spewing from volcanic vents.

57 4 Life in the Solar System Can life exist on other worlds? Extraterrestrial life is life on other worlds. Let s take a look at some places where scientists are searching for extraterrestrial life.

58 4 Mars Life in the Solar System Evidence from space probes has shown that Mars probably had large amounts of water on its surface. If life existed and left evidence, future astronauts will find it.

59 4 Europa Life in the Solar System Europa s ocean could hold more than twice the amount of water that Earth s oceans hold. If life can exist in extremely hot liquid flowing from volcanic vents on Earth s ocean floor, could it not exist in a similar environment if it exists on Europa?

60 4 Titan Life in the Solar System Saturn s moon, Titan is larger than Mercury and has an atmosphere composed mostly of nitrogen. The presence of hydrocarbons on the surface of Titan interests exobiologists, scientists who search for evidence of life on other worlds.

61 4 Titan Life in the Solar System The apparent absence of large impact craters indicates that Titan has experienced internal geologic activity. This activity could provide the energy needed for organic molecules to develop into the building blocks of life.

62 4 Question 1 Section Check What is extraterrestrial life? Answer Extraterrestrial life is life that exists on other planets.

63 4 Question 2 Section Check What makes scientists think that Europa s ocean could contain life? Answer Scientists think that the ocean might be deep and long-lasting, possibly even liquid water that is warmed by Jupiter s gravitational pull on Europa.

64 4 Question 3 Section Check Which performed tests for life on Mars? A. Alvin B. Huygens probe C. Galileo probe D. Viking probe

65 4 Answer Section Check The answer is D. The Viking experiments found no evidence of life on Mars.

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