Science Class

In science class, Rahul's teacher teaches the students about the sun, the earth, and the planets in our solar system.

Meanings in Rahul, Teacher, Classmates

Key words and phrases

planeta large round body that moves around the sunEarth is a planet in our solar system.

sunthe star at the center of our solar systemThe sun gives us light and heat.

earththe planet we live onWe all live on planet Earth.

moonthe natural object that moves around the EarthThe moon shines brightly at night.

solar systemthe sun and all the planets that move around itThere are eight planets in our solar system.

orbitthe curved path a planet takes around the sunThe Earth completes one orbit every year.

gravitythe force that pulls objects toward the groundGravity keeps us from floating away.

stara large ball of burning gas that shines in the skyThere are millions of stars in the sky.

telescopea device used to see distant objects in spaceThey used a telescope to see the moon closely.

curiouseager to learn or know moreHe was curious about how far the sun is.

axisthe imaginary line a planet spins aroundThe Earth spins on its axis once a day.

rotateto spin around on its own axisThe Earth rotates once every twenty-four hours.

revolveto move in a circular path around another objectThe Earth revolves around the sun once a year.

atmospherethe layer of gases surrounding a planetThe atmosphere protects us from harmful rays.

galaxya huge system of stars, planets, and dust held together by gravityOur solar system is part of the Milky Way galaxy.

satellitean object that orbits a planet, natural or man-madeThe moon is a natural satellite of the Earth.

eclipsewhen one heavenly body blocks the light of anotherWe watched a solar eclipse from the school field.

asteroida small rocky object that orbits the sunAn asteroid can be smaller than a planet.

constellationa group of stars that forms a recognizable patternThe teacher showed us the Great Bear constellation.

astronauta person trained to travel in spaceRahul dreams of becoming an astronaut.

Useful sentences

Ask How many planets are there in our solar system?
Answer There are eight planets in total.
Ask Why does the Earth orbit the sun?
Answer Because of the sun's gravity pulling it.
Ask What keeps us from floating into space?
Answer Earth's gravity keeps us on the ground.
Ask Can we see the moon with just our eyes?
Answer Yes, but a telescope shows it much closer.
Ask Is the sun a planet or a star?
Answer The sun is actually a star.
Ask What is the difference between rotate and revolve?
Answer Rotate is spinning on its axis, revolve is moving around another body.
Ask What protects Earth from harmful rays?
Answer The atmosphere protects us from them.
Ask Is the moon a natural or a man-made satellite?
Answer The moon is a natural satellite of the Earth.
Ask Have you ever seen a solar eclipse?
Answer Yes, I watched one from the school field.
Ask What do you want to become when you grow up?
Answer I dream of becoming an astronaut someday.

Dialogue

TeacherToday, we will learn about the sun, the Earth, and the planets.

RahulMa'am, how many planets are there?

TeacherThere are eight planets that orbit the sun.

RahulWhy doesn't the Earth fly away into space?

TeacherBecause of gravity. It's the force that keeps everything in place.

RahulThat's fascinating! I want to look at the stars through a telescope someday.

TeacherYou could even become an astronaut and see the galaxy up close!

RahulMa'am, what's the difference between rotating and revolving?

TeacherRotating means spinning on its own axis, while revolving means moving around the sun.

RahulI understand now. Thank you, ma'am, this was such an interesting class!

Common mistakes

Saying "Sun is a planet" instead of "The sun is a star" (a common factual confusion worth correcting clearly).
Saying "Earth is rotating around sun" instead of "The Earth orbits the sun" or "The Earth revolves around the sun."
Saying "Gravity is pulling down" alone, instead of the fuller "Gravity pulls objects toward the ground."
Confusing "rotate" (spin on its own axis) with "revolve" (move around another body) — they are not interchangeable.
Saying "Moon is satellite of sun" instead of "The moon is a satellite of the Earth" (don't confuse which body the moon orbits).
Saying "I saw eclipse yesterday" instead of "I saw an eclipse yesterday" (don't drop the article "an" before "eclipse").

Quick quiz

1. What is the star at the center of our solar system called?

2. Complete: "The Earth completes one ___ every year."

3. What force pulls objects toward the ground?

4. What is a huge system of stars, planets, and dust held together by gravity called?

5. What word means to spin around on its own axis?

6. What do you call a person trained to travel in space?

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