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Astronomy: Stars, Planets & the Night Sky

What you'll be able to do
  • Name the eight planets in order and explain what a dwarf planet is.
  • Understand space distances using light-travel time and light-years.
  • Explain why the Moon has phases and why we always see the same side.
  • Read star colours and use the Big Dipper to find the North Star.
  • Plan a safe, comfortable night of stargazing where you live, including meteor showers and dark-sky sites.
  • Observe the Sun and eclipses safely, without ever hurting your eyes.

Safety first: never look at the Sun with your eyes, sunglasses, binoculars, a telescope or a camera unless you use certified solar filters. Kids: stargaze with an adult.

Words in this course 24Open the Vocabulary Hall
01

Our neighbourhood: the Sun and the planets

In simple words

The Sun is a giant ball of glowing hot gas, and eight planets go around it, like kids running around a campfire. Earth is the third one from the Sun, the one with water, air and us.

Key facts
  • The Sun is a star. It is the centre of our solar system.
  • Eight planets, in order from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. (A memory trick: "My Very Easy Method Just Speeds Up Naming.")
  • Inner planets (Mercury, Venus, Earth, Mars) are rocky, with solid surfaces.
  • Outer planets: Jupiter and Saturn are gas giants; Uranus and Neptune are ice giants. They have no solid surface to stand on.
  • Dwarf planets recognized by NASA: Ceres, Pluto, Haumea, Makemake and Eris.
  • The International Astronomical Union reclassified Pluto as a dwarf planet in 2006.
  • Planets vs. stars in the sky: planets shine by reflecting sunlight. Five planets can be seen without a telescope: Mercury, Venus, Mars, Jupiter and Saturn. Planets usually shine with a steadier light than stars, which tend to twinkle.
Step by step
  1. Cut 8 paper circles and write a planet name on each: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
  2. Lay them in order in the hallway or backyard, starting from the Sun.
  3. Mark the rocky ones, the gas giants and the ice giants.
  4. Say the memory sentence out loud as you walk past each one.
  5. Say which five planets can be seen without a telescope.
  6. Check: you can say all eight planets in order without looking.
LESSON 01Our neighbourhood: the Sun and the planets
LESSON 01 / ANIMATED LESSON / AI VOICE00:00 / 01:00
Read the video script
[Host] "Let's tour our neighbourhood in space."
[Screen: animation of the Sun and planets in order] "Mercury, Venus, Earth, Mars. Small and rocky."
[Screen: Jupiter, Saturn, Uranus, Neptune] "Then the giants: Jupiter and Saturn are gas giants, Uranus and Neptune are ice giants."
[Text on screen: Pluto = dwarf planet since 2006] "And Pluto? Since 2006, it's officially a dwarf planet."
[Host] "Tonight, look for a bright dot that doesn't twinkle. It might be a planet."
Try it now

Make a planet line in your hallway or backyard. Use 8 paper circles, one for each planet, and put them in order. Say the memory sentence out loud as you place them. Then check a free sky app or website to see which planets are visible tonight from your city.

ClaudeStuck? Copy a ready-made prompt for Claude

Copy this, open Claude, paste it, and Claude will walk you through the lesson step by step.

For a grown-up: Claude is for adults (18+). Copy this, paste it into Claude, and use the answer to explain the lesson to your child.

I'm learning "Astronomy: Stars, Planets & the Night Sky" on The Future Market. Lesson 1: "Our neighbourhood: the Sun and the planets".

What the lesson teaches:
- The Sun is a star. It is the centre of our solar system.
- Eight planets, in order from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. (A memory trick: "My Very Easy Method Just Speeds Up Naming.")
- Inner planets (Mercury, Venus, Earth, Mars) are rocky, with solid surfaces.
- Outer planets: Jupiter and Saturn are gas giants; Uranus and Neptune are ice giants. They have no solid surface to stand on.
- Dwarf planets recognized by NASA: Ceres, Pluto, Haumea, Makemake and Eris.
- The International Astronomical Union reclassified Pluto as a dwarf planet in 2006.
- Planets vs. stars in the sky: planets shine by reflecting sunlight. Five planets can be seen without a telescope: Mercury, Venus, Mars, Jupiter and Saturn. Planets usually shine with a steadier light than stars, which tend to twinkle.

The exercise I'm working on:
Make a planet line in your hallway or backyard. Use 8 paper circles, one for each planet, and put them in order. Say the memory sentence out loud as you place them. Then check a free sky app or website to see which planets are visible tonight from your city.

I'm stuck. Please:
1. Explain the main idea in plain, simple words with one everyday example.
2. Walk me through the exercise one small step at a time. Ask me what I've done so far before giving the next step.
3. Don't just give me the final answer. Help me do it myself, and check my work when I share it.
I'm a parent helping my child (about 8 years old) with a lesson called "Our neighbourhood: the Sun and the planets" from the course "Astronomy: Stars, Planets & the Night Sky".

Here's what the lesson says:
The Sun is a giant ball of glowing hot gas, and eight planets go around it, like kids running around a campfire. Earth is the third one from the Sun, the one with water, air and us.

The activity:
Make a planet line in your hallway or backyard. Use 8 paper circles, one for each planet, and put them in order. Say the memory sentence out loud as you place them. Then check a free sky app or website to see which planets are visible tonight from your city.

Please explain this so an 8-year-old understands: short sentences, a fun everyday example, and no hard words.
Then give me 3 simple questions I can ask my child to check they understood, and a way to do the activity together, one tiny step at a time.
Open Claude
Sources
My notes
02

How far is far? Light-years made simple

This lesson is part of full access: every course and every level for one payment.

03

The Moon and its phases

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04

Stars, colours and constellations

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05

Stargazing: dark skies and meteor showers (with Canadian examples)

This lesson is part of full access: every course and every level for one payment.

06

The Sun and eclipses: look safely

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++

Final project

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??

Quiz

  1. Name the eight planets in order from the Sun.

  2. When was Pluto reclassified as a dwarf planet, and by whom?

  3. Is a light-year a time or a distance?

  4. How long does sunlight take to reach Earth?

  5. How far away is the nearest star after the Sun?

  6. What causes the Moon's phases?

  7. Why do we always see the same side of the Moon?

  8. Which is hotter: a blue star or a red star?

  9. How do you find Polaris?

  10. What is a dark-sky preserve?

  11. Are regular dark sunglasses safe for looking at the Sun?

  12. What is the difference between a solar and a lunar eclipse?

EX

Final exam

This lesson is part of full access: every course and every level for one payment.

CE

Certificate

This lesson is part of full access: every course and every level for one payment.