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1 W-117  [화성과 물의 이야기] The Story of Water on Mars Mars is dry and cold now. Its red surface has dust and rocks. But long ago, it was different. Scientists think Mars had rivers, lakes, and oceans. They found dry riverbeds and valleys. These look like... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 2 W-112  [왜 금성이 가장 뜨거울까?] Why Is Venus the Hottest? Venus is the hottest planet in the solar system. Many people think Mercury is hotter because it is closer to the Sun. But Mercury has thin air, so heat escapes fast. Venus has thick air that traps hea... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 3 W-141  [우리 태양계 여행] A Trip Through Our Solar System The solar system is big and fun to learn about. It has eight planets, many moons, and lots of asteroids. Each planet is different in size, color, and temperature. Mercury is closest to the Sun. It ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 4 W-106  [태양은 어떤 별일까?] What Is the Sun Like? The Sun is the center of the solar system. It is a huge, bright star. It gives Earth light and heat. Without the Sun, there would be no life. Scientists say it formed 4.6 billion years ago from gas an... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 5 W-122  [블랙홀은 무엇일까?] What Are Black Holes? Black holes are strange and powerful things in space. They are so strong that even light cannot escape. But what are they? A black hole forms when a big star dies and falls in on itself. This makes... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 6 W-118  [우주에서 시간은 어떻게 흐를까?] How Does Time Work in Space? Time does not always move the same. In space, gravity and speed can change time. This idea comes from Einstein’s theory of relativity. Near strong gravity, like a black hole, time goes slower. Th... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 7 W-120  [외계 생명은 있을까?] Do Aliens Exist? Many people wonder if aliens are real. Scientists look for life in space with telescopes and space missions. But so far, they have found no clear signs of aliens. Earth is good for life, but other ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 8 W-119  [우주에서의 생활] Life in Space Astronauts live and work on the International Space Station (ISS). It moves around Earth very fast. Life there is very different from life on Earth. In space, there is no gravity, so everything flo... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 9 W-112  [왜 우주에서는 떠다닐까?] Why Do Things Float in Space? In space, everything floats—astronauts, tools, and water. This is because of microgravity. In microgravity, gravity is very weak. Some people think there is no gravity in space, but that is not t... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 10 W-107  [빛보다 빠를 수 있을까?] Can Anything Be Faster Than Light? Light is the fastest thing in the universe. It moves at about 300,000 kilometers per second. That is 1 billion kilometers per hour. Nothing can move faster, says Einstein’s theory. When things mo... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 11 W-117  [우리 은하, 밀키웨이] Our Galaxy, the Milky Way The Milky Way is our galaxy. It has stars, planets, and gas. It holds hundreds of billions of stars. It is so big that light takes 100,000 years to cross it. The Milky Way is a spiral galaxy. It ha... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 12 W-114  [행성 이름은 어디서 왔을까?] Where Do Planet Names Come From? Most planet names come from mythology. Long ago, people saw five planets without a telescope. These are Mercury, Venus, Mars, Jupiter, and Saturn. The Romans named them after gods. Mercury moves fa... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 13 W-116  [토성의 아름다운 고리] Saturn’s Beautiful Rings Saturn is a pretty planet because of its rings. The rings are big, bright, and wide. But what are they made of? The rings are made of ice, dust, and rocks. Some pieces are tiny like sand, and some ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 14 W-108  [왜 목성은 그렇게 클까?] Why Is Jupiter So Big? Jupiter is the biggest planet in the solar system. Over 1,300 Earths can fit inside it. But why is it so big? Jupiter formed early, when the solar system was young. At that time, there was a lot of... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 15 W-114  [화성에서 살 수 있을까?] Could We Live on Mars? Mars is like Earth in some ways. Scientists want to know if people can live there one day. But living on Mars is very hard. Mars has thin air made of carbon dioxide. People cannot breathe it. The a... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 16 W-110  [우주에서는 어떻게 숨을 쉴까?] How Do Astronauts Breathe in Space? Space has no air or oxygen, so humans cannot breathe there. But astronauts use space suits and machines to stay safe. When astronauts go outside the spaceship, they wear space suits. These suits ha... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 17 W-130  [로켓은 어떻게 움직일까?] How Do Rockets Move? Spacecraft do not fly like airplanes. There is no air in space, so wings do not work. Rockets use thrust to move. Thrust works with Newton’s Third Law: “For every action, there is an equal and ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 18 W-112  [우주에도 물이 있을까?] Is There Water in Space? Water is important for life. Scientists have found frozen water on the Moon and Mars. This water could help astronauts live in space one day. The Moon looks dry, but NASA found ice in dark craters ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 19 W-120  [태양계 밖의 행성들] Planets Outside Our Solar System Long ago, people did not know if other planets existed. Today, scientists have found thousands of exoplanets. These are planets outside our solar system. Some exoplanets are big gas planets like Ju... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 20 W-114  [별똥별은 별이 아니야!] Shooting Stars Are Not Stars Shooting stars are not real stars. They are meteors—small space rocks or dust. When they enter Earth’s air, they move fast and get hot. This makes them glow and look like a bright streak. Most bur... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 21 W-103  [우주 쓰레기는 왜 문제일까?] Why Is Space Junk a Problem? Thousands of satellites go around Earth. They help with phones, weather, and science. But when they stop working, they become space junk. Space junk moves very fast—up to 28,000 km per hour. Even... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 22 W-110  [별의 일생] The Life of a Star Stars are born, shine, and die. Their life depends on size. Some stars live for billions of years. Others live a short time. Stars start in a big cloud of gas and dust called a nebula. Gravity pull... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 23 W-118  [초신성은 무엇일까?] What Is a Supernova? A supernova is a huge space explosion. It happens when a big star dies. The star’s center falls in, and the star explodes. A supernova is very bright. It can shine brighter than a galaxy for a sh... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 24 W-107  [우주에서 가장 큰 것들] The Biggest Things in the Universe The universe is very big. Some things in space are so huge, they are hard to imagine. Galaxies are big, but galaxy clusters are bigger. A galaxy cluster has hundreds or thousands of galaxies. Our M... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 25 W-112  [은하는 어떤 모습일까?] What Do Galaxies Look Like? Galaxies are big groups of stars, gas, and dust. Gravity holds them together. There are billions of galaxies, and they have different shapes. There are three main types of galaxies: spiral, ellipti... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 26 W-108  [우주에서는 어떻게 먹을까?] How Do Astronauts Eat in Space? Eating in space is not like eating on Earth. In space, food floats, and drinks spill. So astronauts eat special space food. Long ago, food came in tubes like toothpaste. It was soft and not tasty. ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 27 W-109  [우주 엘리베이터는 가능할까?] Could a Space Elevator Work? A space elevator is a new idea for space travel. It uses a long cable instead of rockets. Vehicles go up and down like an elevator. This could make space travel cheaper and safer. But it is hard to... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 28 W-109  [우주에서는 소리를 들을 수 있을까?] Can You Hear Sound in Space? Sound needs something like air, water, or a solid to travel. On Earth, sound moves through air by shaking tiny particles. But space has almost no particles. So, sound cannot travel in space. If an ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 29 W-106  [왜 별은 반짝일까?] Why Do Stars Twinkle? Stars look like they are twinkling, but they do not really change brightness. They twinkle because of Earth’s air. When starlight comes to Earth, it goes through layers of air. These layers have ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 30 W-109  [달이 사라지면 어떻게 될까?] What Would Happen If the Moon Disappeared? The Moon is more than just pretty. It helps Earth in many ways. If the Moon disappeared, Earth would change a lot. Tides would be weaker. The Moon’s gravity pulls on the oceans and makes tides. M... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 31 W-107  [우주에서는 어떻게 울까?] How Do You Cry in Space? Crying in space is not like on Earth. In space, there is no gravity to pull tears down. Tears stay in the eyes and become water bubbles. Astronauts say it feels strange and not very nice. Space als... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 32 W-109  [다른 행성에도 계절이 있을까?] Do Other Planets Have Seasons? Earth has seasons because it tilts at 23.5 degrees. This tilt changes how sunlight hits Earth during the year. But do other planets have seasons too? Yes, other planets have seasons, but they are d... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 33 W-109  [토성의 가장 큰 위성 타이탄] Saturn’s Largest Moon Titan is the biggest moon of Saturn. It is very special because it has a thick air and lakes. It looks more like Earth than any other moon. Titan’s air has nitrogen and methane. The lakes and riv... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 34 W-112  [왜 플루토는 이제 행성이 아닐까?] Why Is Pluto No Longer a Planet? Pluto was once the ninth planet. But in 2006, scientists changed the rules. Now, Pluto is called a dwarf planet. To be a planet, three things are needed: it must go around the Sun, be round, and cl... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 35 W-106  [우주에서는 왜 운동이 필요할까?] Why Do Astronauts Need to Exercise in Space? In space, there is no gravity. Astronauts do not use their muscles and bones much. If they do not exercise, their bodies get weak. Astronauts on the ISS exercise every day. They use a treadmill wit... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 36 W-113  [우주는 왜 어두울까?] Why Is Space Dark? At night, we see stars in the sky. But space still looks dark. If there are so many stars, why isn’t the sky full of light? This question is called Olbers’ Paradox. A long time ago, a scientist n... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 37 W-112  [가장 가까운 별 프록시마 센타우리] The Closest Star The Sun is the closest star to Earth. But what is the next one? It is Proxima Centauri. It is 4.24 light-years away. Proxima Centauri is part of the Alpha Centauri system. This system has three sta... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 38 W-105  [다이아몬드 행성 55 Cancri e] Diamond ... 55 Cancri e is a strange and special planet. Scientists think it may be made of diamond. It is about 40 light-years away from Earth. It is bigger than Earth but smaller than Jupiter. This kind of pla... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 39 W-106  [올림푸스 몬스: 가장 큰 화산] Olympus Mons: The Biggest Volcano Olympus Mons is the tallest mountain in the solar system. It is on Mars. It is about 22 kilometers high. That is almost three times taller than Mount Everest! Olympus Mons is a volcano made by slow... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 40 W-107  [지구는 왜 둥글까?] Why Is Earth Round? From space, Earth looks round. But why? The answer is gravity. Gravity is a force that pulls things to the center. When a planet forms, gravity makes it round. That is why Earth and other big planets... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 41 W-107  [블랙홀 안에서는 무슨 일이 일어날까?] What Happens Inside a Black Hole? A black hole is a powerful object in space. It forms when a big star falls in on itself. Its gravity is so strong that not even light can escape. The edge of a black hole is called the event horizo... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 42 W-130  [우주에서 가장 큰 폭풍] The Largest Storm in Space Jupiter is the biggest planet in our solar system. It has a huge storm called the Great Red Spot. This storm has lasted for over 350 years. It is so big that 2 or 3 Earths could fit inside it. The ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING © 2026 SPEAK TOWN ENGLISH - LINGUA LABS