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Free scope and sequences, TEKS breakdowns, phenomenon ideas, and engagement activities for the 2024 Texas science standards.

I'm Chris Kesler, a former award-winning Texas middle school science teacher. This is the site I wish I'd had in the classroom. One hub with TEKS breakdowns, scope and sequences, phenomenon starters, engagement ideas, and resources, all aligned to the standards you actually teach.

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All standards updated for the 2024 TEKS revision

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7th Grade TEKS Standards

Click any standard to see what it means, how to teach it, where students get stuck, and aligned resources.

TEKS S.7.9A • Earth & Space

Objects in the Solar System

The Standard

"Describe the physical properties, locations, and movements of the Sun, planets, moons, meteors, asteroids, comets, Kuiper belt, and Oort cloud."

💡 What This Standard Actually Means

The Key Verb

"Describe". Students are describing the physical properties, locations, and movements of objects in our solar system. The TEKS lists exactly which objects to focus on: the Sun, planets, moons, meteors, asteroids, comets, the Kuiper belt, and the Oort cloud. The new additions to this standard are the Kuiper belt and Oort cloud, which weren't called out before. Kids need to know not just what these objects are but where they are and how they move. Instruction can take many forms, such as scaled solar system models, object-comparison research projects, orbit animation analysis, and Kuiper belt and Oort cloud reading activities.

Our solar system is held together by the Sun, a medium-sized star that contains roughly 99.8 percent of all the mass in the system. The Sun gives off light and heat, and its gravity keeps everything else in orbit around it. The planets come next. The four inner ones (Mercury, Venus, Earth, Mars) are smaller, rocky, and closer to the Sun. The four outer ones (Jupiter, Saturn, Uranus, Neptune) are huge, made mostly of gas or ice, and live far from the Sun. Moons are natural satellites that orbit planets. Earth has one. Jupiter and Saturn each have dozens.

Asteroids are small rocky or metallic bodies, and most of them live in the asteroid belt between Mars and Jupiter. Comets are icy bodies that grow a glowing tail when they swing close enough to the Sun for their ice to vaporize. Meteors are the streaks of light we see when small space rocks (meteoroids) burn up in Earth's atmosphere. If a piece survives and hits the ground, it's a meteorite.

The new additions to the 2024 standard are the Kuiper belt and the Oort cloud. The Kuiper belt is a donut-shaped region beyond Neptune's orbit, packed with icy bodies and dwarf planets like Pluto. Most short-period comets come from there. The Oort cloud is a giant spherical shell of icy objects that surrounds the entire solar system at a much greater distance, far past the Kuiper belt. It's the source of long-period comets that take thousands of years to swing through the inner solar system. Students should walk away able to describe each object's properties (size, makeup, what makes it different), where it lives in the solar system, and how it moves relative to the Sun.

💬 From Chris's Classroom

The move that worked for me on this one was handing each student a scrap of paper with the name of one solar system object and asking them to line up from "closest to the sun" to "farthest from the sun." Kids would argue. They'd check each other. Someone would realize the asteroid belt goes between Mars and Jupiter. Someone else would catch that Pluto isn't a full planet anymore. The physical line did the teaching for me. From there, I'd ask, "Which of these belong to the same category?" and we'd regroup into planets, dwarf planets, moons, asteroids, comets, and meteoroids. Way more sticky than a PowerPoint.

⚠️ Misconceptions Your Students May Have

These are some of the most common misconceptions. Knowing what to look for can help you get ahead of them.

"Pluto is a planet"

✓

Pluto was reclassified as a dwarf planet in 2006 by the International Astronomical Union. The solar system has eight planets, not nine. Dwarf planets are their own category: they orbit the sun and are roughly round, but they haven't cleared other objects out of their orbital path. Pluto, Eris, Haumea, Makemake, and Ceres are the currently recognized dwarf planets.

"Asteroids, comets, and meteors are all basically the same thing"

✓

Asteroids are rocky or metallic objects, mostly found in the asteroid belt between Mars and Jupiter. Comets are icy objects that grow a glowing tail when they pass close to the sun. Meteoroids are small rocks traveling through space. A "meteor" is the streak of light when a meteoroid burns up in the atmosphere. If a piece survives and hits the ground, it's called a meteorite. Different words for different things.

"The asteroid belt is packed full of rocks like in the movies"

✓

The asteroid belt between Mars and Jupiter is extremely spread out. Spacecraft like Voyager, Galileo, and Cassini have all passed through it without ever coming close to an asteroid. The belt holds a lot of objects, but the space between them is enormous. Hollywood makes it look dense for dramatic effect, but real asteroids can be millions of miles apart.

"The planets are all about the same size and roughly evenly spaced from the sun"

✓

Textbook diagrams shrink the solar system to fit a page, so students get a false sense of scale. In reality, Jupiter could hold more than 1,300 Earths inside it. Neptune is about 30 times farther from the sun than Earth is. If Earth were the size of a pea, Jupiter would be the size of a grapefruit and Neptune would be a football field away. Scale matters.

📓 Teaching Resources for 7.9A

These resources are aligned to this standard.

Complete 5E Lesson

Objects in the Solar System Complete Science Lesson

The full unit for 7.9A: differentiated station labs, editable presentations, interactive notebooks (English + Spanish), student-choice projects, and assessments. Built on the 5E model.

⏱ Best for: Full unit coverage • Multiple class periods

Station Lab

Objects in the Solar System Station Lab

9-station hands-on lab covering planets, dwarf planets, moons, asteroids, comets, and meteoroids with input stations (Explore It!, Watch It!, Read It!, Research It!) and output stations (Organize It!, Illustrate It!, Write It!, Assess It!). Print and digital. English and Spanish.

🔬 Best for: Core instruction • 1-2 class periods

Student Choice Projects

Objects in the Solar System Student Choice Projects

Choice board with nine project options plus a "design your own" pathway. Students demonstrate their understanding of solar system objects through writing, building, illustrating, presenting, or digital formats.

🎓 Best for: Project-based assessment • 2-3 class periods

🌎 Phenomenon Ideas for 7.9A

Use these real-world phenomena to anchor your lesson. Show students the phenomenon first, let them wonder, then build toward Objects in the Solar System as the explanation.

🔎

Phenomenon 1

A Comet's Glowing Tail

Show students a photo of a comet in the sky, like Comet NEOWISE from 2020 or Hale-Bopp from the 1990s. The comet has a bright nucleus and a long, streaking tail. Most of the time, that same comet has no tail at all. It's just a dark chunk of ice and dust floating far from the sun. So what makes the tail appear?

💬 Discussion Prompt

"A comet only grows a tail when it comes close to the sun. What does that tell you about what the comet is made of? Why don't asteroids grow tails?"

🔎

Phenomenon 2

The Night a "Shooting Star" Streaks Across the Sky

You're outside on a clear night and you see a streak of light flash across the sky. People call it a shooting star, but it's not a star at all. It's a small piece of rock from space hitting our atmosphere. Most of these "shooting stars" are no bigger than a grain of sand.

💬 Discussion Prompt

"If that bright streak is just a grain of sand, how can it glow so brightly? And what's the difference between what we call a meteoroid, a meteor, and a meteorite?"

🔎

Phenomenon 3

Pluto Lost Its Planet Status

Pluto was considered a planet from its discovery in 1930 until 2006. Then scientists reclassified it as a dwarf planet. Pluto itself didn't change. It still orbits the sun, it's still spherical, it still has its own moons. So what changed, and why did that change matter?

💬 Discussion Prompt

"Scientists discovered other objects about Pluto's size out past Neptune. Why would finding more objects make Pluto stop counting as a planet? What does 'clearing its orbit' mean?"

💡 Free Engagement Ideas for 7.9A

Toilet Paper Solar System

Unroll toilet paper or a long strip of adding-machine tape down a hallway. Using a scaled distance chart, have student teams place a label for each object at the correct distance from the sun. Kids immediately see how huge the gaps are, especially between Mars and Jupiter and between Neptune and the outer dwarf planets.

Materials: Roll of toilet paper or adding-machine tape, markers, printable labels

Solar System Object Sort

Prepare a deck of 25 to 30 cards, each with a clue on it (icy body with a tail, rocky object between Mars and Jupiter, has 95 known moons, orbits Earth, reclassified in 2006, etc.). Students sort the cards into the seven categories from the TEKS. Trickier cards spark real debate, which is where the learning happens.

Materials: Printed clue cards, labels for each category

Scale Model With Kitchen Items

Compare planet sizes using grocery store items. Sun: a large watermelon. Jupiter: a softball. Saturn: a grapefruit. Uranus and Neptune: oranges. Earth: a pea. Mars: a small pea or chickpea. Mercury: a peppercorn. Students set them out in order and realize how unlike-scale most textbook images are.

Materials: Grocery items or printed cutouts of fruit at proportional sizes

Meteoroid, Meteor, Meteorite Demo

Wad up a small piece of paper and label it "meteoroid." Set a lamp or flashlight on a desk labeled "atmosphere." Pass the paper through the light beam (quickly) and call it a "meteor" during that moment. Land it on the desk and relabel it "meteorite." Three words, one object, one journey.

Materials: Paper, marker, flashlight, tape to label each stage

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Texas Science Teacher Resource Hub

🚀 Jump to Your Grade

7th Grade TEKS Standards

Objects in the Solar System

💡 What This Standard Actually Means

⚠️ Misconceptions Your Students May Have

📓 Teaching Resources for 7.9A

🌎 Phenomenon Ideas for 7.9A

A Comet's Glowing Tail

The Night a "Shooting Star" Streaks Across the Sky

Pluto Lost Its Planet Status

💡 Free Engagement Ideas for 7.9A

Toilet Paper Solar System

Solar System Object Sort

Scale Model With Kitchen Items

Meteoroid, Meteor, Meteorite Demo

Year-at-a-Glance Pacing Guides

Trusted Across Texas

Texas Schools and DistrictsLove Kesler Science

What Teachers Are Saying

Give Your Science Teachers Everything They Need

See It in Action

Texas Schools and Districts
Love Kesler Science