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Meet the Sun and Its Eight Planets in Order · The Sun is the center of a system of eight planets that orbit it in a fixed order at different distances from near to far.

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Meet the Sun and Its Eight Planets in Order

with Lumi

Lumi the glowing firefly guide floats in dark space beside a bright golden Sun, gently pointing at eight planets lined up on curved paths from nearest to farthest away.

Identify the Sun as the center of our solar system
Name the eight planets in order from the Sun outward
Explain that planets orbit the Sun at different distances from close to far

Key terms

Sun: The big ball of hot glowing gas.
Planet: A big world that orbits the Sun.
Orbit: Moving in a path around something.
Solar system: The Sun and everything circling it.

The Sun Is The Center

Right in the middle of our solar system is the Sun. The Sun is a giant ball of hot, glowing gas. It is so big and so heavy that everything else circles around it. Eight planets travel around the Sun. Moving in a path around something is called an orbit. The Sun stays in the center while all the planets keep orbiting.

Near And Far Planets

The planets do not all sit at the same spot. Some orbit close to the Sun and some orbit very far away. From nearest to farthest, the order is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Earth, our home, is the third one out from the Sun. Neptune is the planet farthest away from the Sun.

Worked examples

Which planet is closest to the Sun?

Start counting at the Sun and look at the first planet.
The very first planet is the closest one.

Answer: Mercury is the planet closest to the Sun.

Hi, I am Lumi! Let's explore our home in space. Right in the middle is the Sun, a giant ball of hot, glowing gas. The Sun is so big that everything else circles around it. Eight planets travel around the Sun. Moving in a path around something is called an orbit. The planets do not all sit at the same spot. Some orbit close to the Sun and some orbit very far away. From nearest to farthest, the order is: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Earth, our home, is the third one out. Neptune is the farthest from the Sun. Here is a trick to remember the order: say 'My Very Energetic Mother Just Served Us Nachos.' Each first letter matches a planet — M for Mercury, V for Venus, E for Earth, M for Mars, J for Jupiter, S for Saturn, U for Uranus, N for Neptune. Say it a few times and the order will stick!

Activity

Put all eight planets in order starting closest to the Sun and moving outward

Practice

Tell what sits in the center of our solar system.

Name the planets in order from the Sun outward.

Common mistakes to avoid

Planets are all the same distanceSome planets orbit close to the Sun and some orbit very far.

Check your understanding

What is in the center of our solar system?

How many planets orbit the Sun?

Which planet is closest to the Sun?

Do all the planets orbit at the same distance from the Sun?

Recap

The Sun is the center of our solar system, and eight planets orbit around it at different distances, from Mercury closest to Neptune farthest away.

Reflect

Which planet name is the most fun for you to say?