Key Facts
- Hangul: 지구 (jigu)
- Meaning: Earth (the planet), globe
- Part of speech: noun
- Origin: Sino-Korean
- Hanja: 地球 (地 earth + 球 sphere)
- Syllables: two (ji-gu)
- Register: Neutral, standard; used in everyday speech, science and news alike.
- Level: A2
Earth in Korean: What Does 지구 Mean?
지구 is a Sino-Korean noun, 地球, for the planet Earth. The characters mean earth and sphere, so the word is already a picture of a round world. It is neutral and standard, used in conversation, textbooks and news alike. It can also mean a globe, as in 지구본 (the globe model). A second 지구 exists with a different Hanja meaning district, but only the planet sense is covered here.
How Do You Pronounce 지구?
Two light syllables: ji-gu. The ㅈ is soft and the ㄱ is plain. RR writes jigu. Before a marker the word keeps its shape: 지구는 is said jiguneun.
How Do You Use 지구 in a Sentence?
지구는 둥글어요.
The Earth is round.
jiguneun dunggeureoyo. 는 marks Earth as the topic and 둥글어요 is the polite word for round. This is the sentence you would find in a science lesson.
지구에는 물이 많아요.
There is a lot of water on Earth.
jigueneun muri manayo. 에는 sets the place as Earth, with 는 adding contrast with other planets. 물이 is the water as subject, and 많아요 says there is plenty of it. The sentence reads as a general fact about Earth.
우리는 지구를 지켜야 해요.
We have to protect the Earth.
urineun jigureul jikyeoya haeyo. 를 marks Earth as the thing being protected. 지켜야 해요 means have to protect, so this sentence is an appeal. 우리 means we.
Common Word Combinations
| Korean | English |
|---|---|
| 지구 온난화 | global warming |
| 지구를 지키다 | to protect the Earth |
| 지구 반대편 | the other side of the world |
| 지구본 | globe (model) |
지구 온난화 is global warming and is the most frequent phrase in the news. 지구를 지키다 is the language of campaigns. 지구 반대편 means the other side of the world, and 지구본 is a spinning globe on a desk.
Common Mistake
Wrong: Using 지구 to say ground or land, as in sitting on the ground.
Correct: 땅 or 바닥 for the ground; 지구 only for the planet.
지구 is the whole planet, so a sentence about sitting on the floor would sound like you were sitting on Earth in space.
How Does 지구 Differ from Similar Words?
| Word | Meaning | How to tell it from 지구 |
|---|---|---|
| 땅 | ground, land, soil | A native word for the ground you stand on, not the planet. |
| 세계 | world | The world of countries and people, not the physical planet. |
| 행성 | planet | Any planet at all. 지구 is the specific one. |
Looking at a Globe in a Classroom
Two classmates are using a globe to find Korea and compare places on the planet.
Mina
이 지구본에서 한국을 찾아볼까요?
I jiguboneseo Hangugeul chajabolkkayo?
Shall we find Korea on this globe?
Alex
네, 여기 있어요.
Ne, yeogi isseoyo.
Yes, it’s here.
Mina
지구 반대편에는 뭐가 있어요?
Jigu bandaepyeoneneun mwoga isseoyo?
What is on the other side of the Earth?
Alex
지구본을 돌려 봐요.
Jiguboneul dollyeo bwayo.
Let’s turn the globe and look.
지구본 names the classroom object the students can turn. 지구 반대편 refers to the far side of the actual planet. The dialogue moves between a model and what it represents, which is why both 지구 and 지구본 belong naturally in the same conversation.
Where Will You Hear 지구?
지구 occurs in science lessons, space documentaries and environmental messages. 지구를 지키다 literally means “protect the Earth”. In a campaign, the phrase calls for care for the planet and its environment. It does not usually describe guarding a physical object, as a person might guard a door.
지구 온난화 means global warming. 온난화 names warming, while 지구 tells you the scale. A weather report about one hot afternoon does not automatically describe 지구 온난화: the phrase belongs to discussion of warming at the planetary scale. Recognizing the complete expression helps distinguish a climate topic from a local weather description.
지구 반대편 literally means the opposite side of Earth. In travel talk, people can use it loosely for somewhere very far away. It need not identify the exact point directly opposite the speaker on a globe. The level of precision depends on whether the speaker is discussing geography or describing a long journey.
Earth, a Planet and a Classroom Model
행성 is the general word “planet”; 지구 names one particular planet. In a space lesson, these words answer different questions: the name of our planet is 지구, and the kind of celestial body it is is a 행성. 달 means the Moon and 태양 means the Sun, so they belong in the same conversation without being other names for Earth.
지구본 is the clearest word for the physical globe used as a model. If you want someone to pass you the classroom object, naming 지구본 makes the request precise. The shared 지구 part tells you what the model represents. A map, 지도, presents places differently and is a separate object word.
Korean has no uppercase and lowercase letters. 지구 keeps the same Hangul spelling whether it begins a sentence or appears in the middle. English translations capitalize “Earth” when naming the planet, but that capitalization distinction does not create a second Korean spelling.
Words for Talking about Our Planet
| Korean | Meaning | Useful note |
|---|---|---|
| 우주 | space / universe | The wider setting for a conversation about planets. |
| 태양 | Sun | The star Earth moves around. |
| 달 | Moon | Earth’s natural satellite. |
| 환경 | environment | Common beside 지구 in conservation messages. |
| 지도 | map | A flat representation, compared with a 지구본. |
The space and planets vocabulary lesson teaches the wider set. Keep the English sense of “earth” in mind when translating: soil is 흙, ground or land is 땅, and our planet is 지구. A gardening sentence about earth on someone’s hands needs a different noun from a sentence about Earth seen from space.
Quick Self-Test
- Which word names the model a student can spin: 지구 or 지구본?
- Does 지구 반대편 always identify an exact geographical point?
- Which Korean word fits “earth” when it means soil?
Show answers
- 지구본 is the precise word for the physical globe.
- No. In everyday travel talk it can loosely mean a very distant place.
- 흙. 지구 names the planet.
Frequently Asked Questions
Does 지구 Mean Earth or the Ground?
Earth, the planet. The ground you stand on is 땅.
What Is the Difference between 지구 and 세계?
지구 is the planet. 세계 is the world as countries and people.
How Do I Say Global Warming?
지구 온난화. It places 지구 before the word for warming.
What Is a Globe Called?
지구본. It adds a word for model to 지구.
Where to Go Next
Look up related science and space words on the nature geography space vocabulary page. Two words often confused with this one are the ground and the world. To practise, try the vocabulary flashcard decks or return to Korean words A to Z.