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Is the Sun a Planet

Interactive passage with audio narration, comprehension questions, and printable PDF.

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Format: Interactive (Online), Printable (PDF)
Grades: 5678
Subjects: scienceela
Standards: MS-ESS1-3
Languages: English, Spanish

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What's included

Reading passage

Reading comprehension

Audio narration

With word word highlighting

Comprehension quiz

Auto-graded

Writing activity

Open-ended response

Glossary & flashcards

Vocabulary practice

Differentiated version

Adapted for varied levels

Spanish translation

Bilingual support

About this reader

This 400-500 word informational science passage is designed for middle school students in grades 6-8 and addresses a common misconception: Is the Sun a planet? The passage clearly explains that the Sun is a star, not a planet, and explores the defining differences between these two types of celestial objects. Students learn that stars produce their own light through nuclear fusion, while planets reflect starlight. Aligned with NGSS standards MS-ESS1.B and MS-ESS1-3, this passage helps students understand the classification logic behind astronomical objects. The content includes real-world examples, evidence-based explanations, and age-appropriate scientific terminology. Audio-integrated features support diverse learners, including English Language Learners and struggling readers. The passage includes a simplified differentiated version, Spanish translations, vocabulary glossary, multiple-choice questions, writing activities, and graphic organizers to reinforce understanding of this fundamental Earth and space science concept.

Written by Workybooks TeamPublished by Workybooks

Sample passage and quiz content

CONTENT PREVIEW

Vibrant mountain landscape with bright sun and clear blue sky, capturing natural beauty and tranquility. — The Sun is a star.Stars like the Sun generate their own light and heat through a process called nuclear fusion. Image by Erica On The Go / Pexels.

The Sun is not a planet. It is a star, which means it belongs to a completely different category of objects in space. Understanding why the Sun is classified as a star helps scientists organize and study the universe. The key difference between stars and planets lies in how they produce light.

Stars like the Sun generate their own light and heat through a process called nuclear fusion. Deep inside the Sun's core, temperatures reach about 15 million degrees Celsius. At these extreme temperatures, hydrogen atoms slam together with tremendous force. When they collide, they combine to form helium atoms. This process releases enormous amounts of energy in the form of light and heat. Scientists explain that nuclear fusion is what makes stars shine brightly. The Sun has been producing energy this way for about 4.6 billion years.

Planets work very differently from stars. Planets do not produce their own light through nuclear fusion. Instead, they reflect light from nearby stars. Earth, for example, reflects sunlight, which is why we can see it from space. Planets are much smaller and cooler than stars. They orbit around stars because of gravity, the force that pulls objects toward each other. Evidence shows that planets form from leftover material after a star is born.

The solar system contains one star, the Sun, and eight planets that orbit it. Jupiter is the largest planet in our solar system. Even though Jupiter is huge, it is still much smaller than the Sun. The Sun contains about 99.8 percent of all the mass in the solar system. Scientists observe that this massive size allows the Sun to maintain the high temperatures needed for nuclear fusion. Jupiter and other planets lack the mass and temperature to start this process.

Understanding the difference between stars and planets matters for astronomy and space exploration. When scientists search for life on other worlds, they look for planets orbiting distant stars. They study the light from these stars to learn about the planets around them. Knowing that stars produce light while planets reflect it helps scientists identify new exoplanets, or planets outside our solar system. This classification system allows researchers to communicate clearly about their discoveries.

Interesting Fact: If the Sun were the size of a basketball, Earth would be about the size of a small peppercorn located 26 meters away. This comparison shows just how much larger stars are compared to planets.

What is the Sun classified as?

A planetA starAn asteroidA moon

How do stars produce light?

By reflecting light from other objectsBy burning fuel like woodThrough nuclear fusion in their coresBy absorbing energy from planets

According to the passage, what is nuclear fusion?

A process where atoms split apartA process where hydrogen atoms combine to form heliumA type of chemical reaction on planetsThe cooling of a star's surface

What is the main way planets produce light that we can see?

They create their own light through fusionThey reflect light from nearby starsThey glow from internal heatThey absorb darkness from space

What does the term 'exoplanet' mean in the passage?

A planet in our solar systemA planet that no longer existsA planet outside our solar systemA very large planet

Why can Jupiter not start nuclear fusion like the Sun?

It is too far from the SunIt lacks the mass and temperature neededIt is made of different materialsIt orbits too quickly

What percentage of the solar system's mass does the Sun contain?

About 50 percentAbout 75 percentAbout 99.8 percentAbout 25 percent

Based on the passage, why is understanding the difference between stars and planets important for scientists?

It helps them build better telescopesIt allows them to search for life on other worlds and identify exoplanetsIt makes space travel easierIt helps predict weather on Earth

True or False: Planets orbit around stars because of gravity.

TrueFalse

True or False: The Sun produces energy by reflecting light from other stars.

TrueFalse