Why do Planets have Orbits?

Summary

Who Smarted? Podcast Summary

Episode: Why do Planets have Orbits?
Date: March 20, 2026
Host & Cast: Adam Tex Davis, Jerry Colbert, Olivia Davis
Podcast for: Kids and families

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Episode Overview

This episode of "Who Smarted?" playfully explores the science of planetary orbits. Using the fun and relatable setting of an amusement park, the hosts turn cosmic facts into a thrilling ride for kids and curious listeners. Throughout, the hosts compare spinning rides to planetary motion, unveil the origins of the solar system, and explain why planets don’t crash into the sun or each other.

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Key Discussion Points & Insights

1. Living on a Spinning Ride

• The host sets the scene at an amusement park, comparing planet Earth to an endless spinning ride.
• Key Fact:
  "At all times, you are moving up to 1,000 miles, or about 1,700 kilometers an hour." – Adam Tex Davis [01:23]
• Earth rotates at 1,000 mph at the equator and moves around the sun even faster—67 times the rotational speed.

2. Comparing Orbits to Carnival Rides

• The amusements of spinning rides, such as the swing ride and bumper cars, become metaphors for cosmic motion.
• Earth orbits the Sun at about 67,000 mph—"faster than a rollercoaster" [02:06].

3. Solar System’s Galactic Journey

• Just as the Earth revolves around the Sun, the whole solar system orbits the center of the Milky Way.
• Fun Fact with Interactive Quiz:
  "What is at the center of the Milky Way? … The center of the Milky Way galaxy is B, a black hole." – Adam Tex Davis [03:52]
• The solar system takes 220–250 million years to orbit the galactic center.

4. Planetary Collisions: A Bumper Car Past

• Early solar system was chaotic, full of crashes between forming planets ("planetesimals").
• Memorable Moment:
  “Imagine if the planets did bump around all the time like bumper cars. Oh boy. We’d be living in constant fear that one day we’ll smack into Mars, Venus, or worse, Jupiter." – Adam Tex Davis [05:07]
• Collisions mostly stopped after planets formed and cleared their paths.

5. The Pizza Dough Analogy: Formation of the Solar System

• The solar system formed much like pizza being spun and stretched.
• Host visits a pizza stand and compares dough to the nebula—the cloud of gas and dust that became our solar system.
• Quote:
  "Think of that clump of pizza dough you’re holding. Like the nebula that became our solar system." – Adam Tex Davis [06:03]
• A supernova (a nearby exploding star) got the nebula spinning. The sun formed at the center; planets and other objects formed from the remaining spinning matter.
• All planets orbit in the same general direction as the nebula’s spin, just like the direction pizza dough stretches when tossed [07:05].

6. Why Planets Don’t Crash into the Sun: Gravity and Momentum

• The sun’s gravity pulls on the planets, trying to bring them closer.
• Crucial Point:
  "What keeps them from crashing into it? … The answer is gravity." – Adam Tex Davis [08:11]
• The speed (momentum) of each planet balances the pull of gravity. Too slow, and a planet would spiral into the sun; too fast, it would fly off into space.
• Mercury moves fastest (closer to the sun); Neptune is slowest (further away).
  "Everything is in balance." – Adam Tex Davis [11:39]
• This stable balancing act keeps planets in orbit—unless a big outside force (like a star exploding) changes things.

7. Direction of Orbits: Counterclockwise (But Not Always)

• Looking down from above the sun’s north pole, all major planets move counterclockwise.
• Not every solar system spins the same way; some go clockwise, some counterclockwise.
  "Planetary movement happens randomly, depending on the force that hits the nebula that created the planets." – Adam Tex Davis [10:43]

8. The Shape of Orbits: Ovals, Not Circles

• Orbits are elliptical (oval-shaped), not perfectly circular.
• Clarification:
  "The answer is B, oval. Even though the planetary orbits are almost circular, they're actually elliptical, which means they’re like ovals." – Adam Tex Davis [12:22]
• During summer in the Southern Hemisphere, Earth is closest to the sun (perihelion), not during Northern Hemisphere summer.

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Notable Quotes & Memorable Moments

• On Earth’s Speed:
  "At all times, you are moving up to 1,000 miles, or about 1,700 kilometers an hour." – Adam Tex Davis [01:23]

• Milky Way Center:
  "The center of the Milky Way galaxy is B, a black hole." – Adam Tex Davis [03:52]

• Bumper Car Chaos:
  "Imagine if the planets did bump around all the time like bumper cars. Oh boy." – Adam Tex Davis [05:07]

• Pizza Dough Analogy:
  "Think of that clump of pizza dough you’re holding. Like the nebula that became our solar system." – Adam Tex Davis [06:03]

• What Keeps Planets in Orbit?
  "The sun’s gravity pulls on the planets, but what keeps them from crashing into it? … The answer is gravity." – Adam Tex Davis [08:11]
  "Everything is in balance." – Adam Tex Davis [11:39]

• Orbits are Ovals:
  "Even though the planetary orbits are almost circular, they’re actually elliptical, which means they’re like ovals." – Adam Tex Davis [12:22]

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Timestamps for Important Segments

• 00:00–01:12: Introduction, amusement park setting, Earth’s rotation and speed
• 02:03–02:36: Earth’s orbit around the sun, solar system speeds
• 03:14–03:52: Orbits in the galaxy, Milky Way’s black hole center
• 05:00–06:11: Early solar system collisions, bumper car metaphor
• 06:03–07:05: Pizza dough analogy for solar system formation
• 08:11–08:23: Gravity and planetary orbits explained
• 09:32–10:43: Orbit directions (clockwise vs counterclockwise)
• 11:19–12:09: Gravity vs momentum; keeping planets in orbit
• 12:22–12:42: Shape of planetary orbits (ellipses)
• 12:44–13:27: When Earth is closest to the sun; wrapping up

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Structure & Style

• The episode uses lively dialogue, sound effects, quizzes, and analogies (pizza, bumper cars, amusement rides) to explain astronomical concepts.
• Tone is playful, humorous, and highly engaging, making complex science memorable and fun.

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Summary Takeaway

In this ride-themed adventure, the "Who Smarted?" team reveals that planetary orbits are like a perfectly balanced, centuries-long amusement park ride: set in motion by cosmic forces, held together by gravity and speed, and shaped like giant ovals. With humor and interactive quizzes, children (and adults) come away understanding not just why planets have orbits, but also how our solar system formed, why planetary crashes are rare now, and that—just like in an amusement park—the universe keeps spinning and orbiting in delightful, sometimes unpredictable ways.

Transcript

[Adam Tex Davis]

And now it's time for who's Smarted? Hey, smartypants, I'm sure you recognize these sounds. Yep, I'm back at the amusement park. I just can't get enough. Roller coasters, water rides, thrilling drop rides, and of course, rides that spin around and around and around.

[Jerry Colbert]

Mister, if you're looking for the merry go round, you're in the wrong line.

[Adam Tex Davis]

Nope, my bubble gum chewing, bubble blowing friend. While the merry go round is fun, I'm here for the swing ride. You know, the one where you sit on chairs that zip around high in the air as if orbiting a pedestal?

[Jerry Colbert]

Yeah, I work here.

[Adam Tex Davis]

Yes, I know you know, but never mind. Smartypants, are you fans of rides that go around and around? If so, you're in for a treat. And if you're not, I have some interesting news to share with you.

[Jerry Colbert]

Six credits.

[Adam Tex Davis]

Excuse me?

[Jerry Colbert]

You need six credits to ride? You going on or not?

[Adam Tex Davis]

Yes, but first, I need to let the smarty pants know that whether you like it or not, you're already on a spinning ride that goes around and around. Do you know what ride that is?

[Jerry Colbert]

You got the six credits or what?

[Adam Tex Davis]

Wow, you are really good at blowing bubbles and interrupting. Here, here's my wristband.

[Jerry Colbert]

Enjoy the ride.

[Adam Tex Davis]

So, smarty pants, what spinning ride are you on right now, even if you think you're standing still? Did you say the ride known as Planet Earth? That's right. And do you know how fast you're spinning right now? Is it up to A, 42 miles an hour, B, 340 miles an hour, or C, 1,000 miles an hour? Well, hold on to your hats, because the answer is C. At all times, you are moving up to 1000 miles, or about 1700 kilometers an hour. Whoa. Oh. And that's not all, sir.

[Jerry Colbert]

You're holding up the line.

[Adam Tex Davis]

I'm going, I'm going.

[Jerry Colbert]

Buckle up. Don't throw anything.

[Adam Tex Davis]

Gotcha. As I was saying, smarty pants, that's not all. As you probably know, Earth orbits the sun. But did you know Earth orbits the sun at a speed faster than its rotation? About 67 times faster. In fact, at that speed, you'd be able to fly from New York to London in about three minutes.

[Jerry Colbert]

Yeah, this ride doesn't go that fast.

[Adam Tex Davis]

You don't understand. Right now, we're all going that fast.

[Jerry Colbert]

Whatever. Hold onto your hat.

[Adam Tex Davis]

So, smarty pants, how do orbits work? How did they form? And could the planets ever crash into each other? Or the sun? Whoa. It's time for another big whiff of

[Olivia Davis]

science on who Smarted? Who's smarted? Who's smart? Is it you? Is it me? Is it science or history? Listen up everyone. We make smarting lots of fun. Who's smarted?

[Adam Tex Davis]

Hey, smarty pants, did you know that some rides at amusement parks are just like the planetary orbits. They go around and around a central point. And just think, as you go around here, Earth is going around the sun, while the sun is going around the center of our galaxy, the Milky Way. Smarty pants, do you know what is at that center of the Milky Way? Is it A, a giant star, B, a black hole, or C, a delicious chocolate nougat and caramel? Why, it's C, of course, if you're talking about a Milky Way candy bar. But the center of the Milky Way galaxy is B, a black hole.

[Olivia Davis]

Whoa.

[Adam Tex Davis]

The sun and the whole solar system moves around this black hole at around 447,000 miles per hour, or 200 kilometers per second. That's over 100 times faster than the world's fastest plane. And even at that super fast speed. Do you know how long it takes the solar system to orbit the Milky Way center? Up to 500 days? Up to 3,000 years, or up to 250 million years. The answer is 220 to 250 million years. Of course, it doesn't take that long for the Earth to orbit the Sun. I know you know that number. Go ahead, shout it out. Yep, compared to the galaxy, the 365 days it takes Earth to orbit the sun seems like nothing. And I'm sure you also know there are seven other planets, numerous dwarf planets, asteroids, and other objects orbiting the sun too. And for the most part, they don't bump into each other. Unlike the people on this ride. Smartypants, do you know what ride I'm on? If you said the bumper cars, you're right.

[Jerry Colbert]

Okay, ride's over. Everybody out.

[Adam Tex Davis]

But imagine if the planets did bump around all the time like bumper cars. Oh boy. We'd be living in constant fear that one day we'll smack into Mars, Venus, or worse, Jupiter. But here's the crazy thing. At one point in time, the objects in our solar system did collide like that. Whoa.

[Jerry Colbert]

Great. Whatever. You planning to ride again or what?

[Adam Tex Davis]

No, I think I'll grab some lunch. Smarty pants, do you know when all these collisions in our solar system took place? If so, go ahead and shout out your answer. If not, I'll tell ya. It happened back when the solar system was formed.

[Olivia Davis]

Hello, my friend. Welcome to the best pizza parlor in the amusement park. For you, I'm gonna make a nice pepperoni pizza pie.

[Adam Tex Davis]

Great. And also that will help me demonstrate, because in some ways, smarty pants, the solar system formed like a pizza.

[Olivia Davis]

A pizza.

[Adam Tex Davis]

Yep. Think of that clump of pizza dough you're holding. Like the nebula that became our solar system. Basically a big cloud of dust and gas.

[Olivia Davis]

Scoozy.

[Adam Tex Davis]

About 4.6 billion years ago, something happened that got that cloud in motion. Perhaps the explosion of a nearby star. Soon, the whole cloud was moving around like pizza dough being tossed into the air. Parts of it combined, forming the sun in the middle. The rest moved faster and faster and flattened out like pizza dough, stretching as it's tossed.

[Olivia Davis]

A true work of art.

[Adam Tex Davis]

At this point, the matter in other parts of the cloud started to clump together and smash into each other. Just like the bumper cars, these clumps collected the matter they smashed into, becoming larger and larger and clearing their path as they went around the center. Eventually, these clumps of matter became planets, each swirling around with their own rotation as they continue to orbit the center.

[Olivia Davis]

The dough is getting very big now.

[Adam Tex Davis]

And all these things continued in the same direction as the original nebula. Like, they are still part of a twirling pizza dough. And the planets will continue to move in the same direction and distance apart from each other as long as there's nothing to stop them.

[Olivia Davis]

Mamma mia. I got too excited, and I threw the dough onto the ceiling.

[Adam Tex Davis]

It's okay. I'll just grab a slice.

[Olivia Davis]

Good choice. You a nice man.

[Adam Tex Davis]

Thanks. So, smarty pants, the movement of the nebula that created Our Solar System 4.6 billion years ago led to the planetary movement that we have today. And all the planets are lined up with the center of the sun because that nebula flattened out just like the rotating pizza crust. In fact, all the planets move in the same direction as the sun's rotation, and they stay in their orbits because of a particular force. Any idea what that is, smarty pants? Is it A, gravity, B, magnetism, or C, mitochlorians? The answer is gravity. The sun's gravity pulls on the planets, but what keeps them from crashing into it? To answer that, we'll blast into space on this space rocket ride.

[Jerry Colbert]

That'll be eight credits.

[Adam Tex Davis]

Sure. Scan away. How is it that you work at every ride in the park?

[Jerry Colbert]

Enjoy the ride.

[Adam Tex Davis]

Wait, shouldn't I get a spacesuit or something?

[Jerry Colbert]

Nah, just keep your hands inside the ride at all times.

[Olivia Davis]

Whoa.

[Adam Tex Davis]

So, smarty pants, what actually keeps the planets in their orbits? We'll have that answer from space right after this Quick break. Spring is here and if you're a homeschool family trying to finish the year strong, I want to tell you about ixl. It's the award winning online learning platform that fits seamlessly into your homeschool routine covering math, language arts, science and social studies from Pre K through 12th grade. What I love most about IXL is how it adapts to each child's pace. Whether your kid needs to reinforce foundational skills before an assessment or push ahead into new material, IXL meets them exactly where they are. With no pressure and real encouragement built right in. Kids earn rewards, see their own progress, and actually feel good about learning. And for parents, the real time progress tracking is a game changer. You always know exactly where your child stands. Plus, it makes learning fun. And you know I love that. Over 15 million students use IXL and it's proven to improve achievement in all 50 states. So make an impact on your child's learning. Who smarted? Listeners get an exclusive 20% [e-mail] smarted that's ixl.com smarted for your 20% off. Now back to who's smarted. Okay, smarty pants. We're high up in space now, looking down at the sun's north pole. From here, in what direction are all the planets moving? Is it in the same direction as the hands of a clock, also known as clockwise, or in the other direction, also known as counterclockwise? If you said counterclockwise, you're right. Now answer this. True or false? Planets in every solar system move counterclockwise. The answer is false. Some actually go clockwise. Planetary movement happens randomly, depending on the force that hits the nebula that created the planets. It's the same thing with galaxies. Scientists think that half spin one way while the other half spin in the opposite direction.

[Jerry Colbert]

If you want to visit another galaxy, it'll cost you six more credits.

[Adam Tex Davis]

No, that's not what we're. Hey, what are you doing here?

[Jerry Colbert]

What does it look like I'm doing? Working.

[Adam Tex Davis]

Anyway, smarty pants, if the planets in our solar system are being pulled by the sun's gravity, what's keeping them from crashing into the sun?

[Jerry Colbert]

I don't know how the rides work. I just push the button.

[Adam Tex Davis]

Smartypants Consider this. The fastest moving planet, Mercury, is closest to the sun, while the slowest moving one, Neptune, is farthest away. Did you say the speed of the planet is what keeps it from crashing into the sun? If so, nice job. If a planet's forward momentum was too small, the sun's gravity would pull it in. But if its momentum was too great, it would go flying off, never to be seen again. Mercury experiences a tremendous amount of the sun's gravity, so it needs to move fast, while Neptune, billions of kilometers away, doesn't require as much momentum. Everything is in balance. So the planets stay in orbit and will continue to do so until hit by an outside force like a star exploding. But don't worry. That shouldn't happen in your lifetime.

[Jerry Colbert]

Great. So the planets will just keep spinning around in circles like my life.

[Adam Tex Davis]

Well, that's not exactly true.

[Jerry Colbert]

Huh? Are you saying my life isn't spinning in circles?

[Adam Tex Davis]

No, I'm saying the planets don't move in circles, smarty pants. What shape is a planetary orbit? Is it A square, b oval, or C irregular? The answer is B oval. Even though the planetary orbits are almost circular, they're actually elliptical, which means they're like ovals.

[Jerry Colbert]

Fine, my life is going around and around like ovals.

[Adam Tex Davis]

But get this. At some point, a planet is closer to the sun than at other points. When do you think Earth is closest to the sun? Is it summertime in the Northern hemisphere, summertime in the Southern hemisphere, or during the March equinox? The answer is during summertime in the Southern hemisphere, it's actually at its farthest point from the sun during summertime in the Northern Hemisphere. And speaking of the Northern hemisphere, it's about time I get back there.

[Jerry Colbert]

It'll be eight more credits what I

[Adam Tex Davis]

have to pay to get back.

[Jerry Colbert]

You did say Earth is a ride, right? Yeah, but eight credits.

[Adam Tex Davis]

Fine. Besides, Earth is the best ride on the planet.

[Jerry Colbert]

Buckle up. Enjoy the ride.

[Adam Tex Davis]

A cosmic shout out to George in Saskatchewan, Canada. Thanks for letting us know how much you love learning about science and history and that you think who Smarted makes learning fun for everyone. Even mom and dad. Keep on smarting with us, smarty pants. This episode, Planetary Orbits was written by Dave Beaudry and voiced by Olivia Davis, Max Kamasky and Jerry Colbert. Technical direction and sound design by Josh Hahn. Who's Smarted is recorded and mixed at the Relic Room studios. Our associate producer is Max Kamasky. The theme song is by Brian Suarez with lyrics written and performed by Adam Tex Davis. Who's Smarted was created and produced by Adam Tex Davis and Jerry Culver. This has been an Atomic Entertainment production.

[Olivia Davis]

Who smarted.