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What Are Moons

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 reading passage introduces middle school students (grades 6-8) to the concept of moons as natural satellites. Aligned with NGSS standard MS-ESS1-3 and Disciplinary Core Idea MS-ESS1.B (Earth and the Solar System), the passage defines moons and emphasizes their remarkable diversity in size, composition, and origin. Students learn that moons range from tiny captured asteroids to worlds larger than Mercury, challenging the common misconception that all moons resemble Earth's Moon. The passage includes real-world examples from our solar system, incorporates science practices through evidence-based language, and features audio integration for enhanced accessibility. Supplementary materials include a Spanish translation, simplified differentiated version for English Language Learners and struggling readers, glossary of key terms, multiple-choice comprehension questions, writing activities, and graphic organizers. This comprehensive resource helps students develop foundational understanding of celestial bodies and their relationships within the solar system.

Written by Workybooks TeamPublished by Workybooks

Sample passage and quiz content

CONTENT PREVIEW

Icy Moons in Our Solar System That May Have Oceans Now — Scientists think six icy moons in our solar system may currently host oceans of liquid water beneath their outer surfaces. Arranged around Earth are images from NASA spacecraft of, clockwise from the top, Saturn's moon Enceladus, Jupiter's moons Callisto and Ganymede, Neptune's moon Triton, Saturn's moon Titan, and Jupiter's moon Europa, the target of NASA's Europa Clipper mission./ NASA

A moon is any natural satellite that orbits a planet, dwarf planet, or asteroid. Scientists observe that moons come in many different sizes and shapes. Some moons are tiny rocks only a few kilometers wide. Other moons are massive worlds larger than the planet Mercury. This incredible variety shows that moons can form in different ways.

Evidence shows that moons have different origins and compositions. Some moons formed alongside their parent planets from the same cloud of gas and dust. Other moons are captured objects that wandered too close to a planet's gravitational pull. Scientists explain that captured moons often have irregular shapes because they were once asteroids. Regular moons tend to be more spherical because gravity shaped them during formation. The composition of moons varies widely too. Some contain mostly ice, while others are made of rock and metal.

Jupiter's moon Ganymede provides a clear example of moon diversity. Ganymede measures 5,268 kilometers in diameter, making it larger than Mercury. This giant moon has its own magnetic field, something most moons lack. In contrast, Mars has two small moons called Phobos and Deimos. These moons measure only 22 and 12 kilometers across. Scientists think Phobos and Deimos may be captured asteroids because of their irregular shapes and rocky composition. The difference between Ganymede and Phobos shows how different moons can be.

Understanding moons helps scientists learn about the history of our solar system. Moons provide clues about how planets formed and evolved over billions of years. Some moons may have subsurface oceans that could support life. Studying the variety of moons teaches us that celestial bodies in space are more diverse than we once thought. Each moon has its own story to tell about the solar system.

Interesting Fact: Saturn has at least 146 known moons, more than any other planet in our solar system. Scientists continue to discover new small moons orbiting Saturn using powerful telescopes.

What is a moon?

A natural satellite that orbits a planet, dwarf planet, or asteroidA man-made object that orbits EarthA star that produces its own lightA planet that orbits the Sun

According to the passage, how do captured moons differ from moons that formed with their planets?

Captured moons are always larger than regular moonsCaptured moons often have irregular shapes while regular moons are more sphericalCaptured moons are made only of iceCaptured moons orbit faster than regular moons

What does the word 'composition' mean in the context of this passage?

The speed at which a moon orbitsThe distance between a moon and its planetWhat something is made of or the materials that form itThe size and shape of an object

Which moon mentioned in the passage is larger than the planet Mercury?

PhobosDeimosEarth's MoonGanymede

Why do scientists think Phobos and Deimos might be captured asteroids?

Because they are very far from MarsBecause they have irregular shapes and rocky compositionBecause they are larger than Earth's MoonBecause they have their own magnetic fields

Based on the passage, what can studying moons tell scientists?

Only how planets orbit the SunHow to build better telescopesAbout the history and formation of the solar systemThe exact age of Earth

What makes Ganymede unusual compared to most other moons?

It is made entirely of iceIt has its own magnetic fieldIt orbits Mars instead of JupiterIt is the smallest moon in the solar system

Which statement best describes the variety of moons in our solar system?

All moons are similar in size and compositionMoons vary greatly in size, composition, and originOnly large planets have moonsAll moons are made of rock and metal

True or False: All moons formed at the same time as their parent planets.

TrueFalse

True or False: Saturn has more known moons than any other planet in our solar system.

TrueFalse