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Beyond Earth

Eight planets, eight real distances

How many planets circle the Sun? Which one is closest?

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Textbook pictures often show eight planets, evenly spaced.
Step 1 of 4
  1. Textbook pictures often show eight planets, evenly spaced.
  2. The real first four sit close together.
  3. Then comes one long gap.
  4. Then the rest spread even farther out.

The rule

Eight planets orbit the Sun, and Mercury is closest. To orbit is to go round in a path. Each planet has its own distance. Neptune is farthest.

The eight planets, in order out from the Sun
OrderPlanetOne thing to remember
1MercuryClosest to the Sun, and small
2VenusThe brightest planet in our sky
3EarthOurs
4MarsOften looks slightly reddish
5JupiterBy far the biggest planet
6SaturnFamous for its wide, flat rings
7UranusCircles the Sun tipped on its side
8NeptuneThe farthest planet out

Jump to lesson

This track

  1. 0 Start here
  2. 1 A star, a planet, or the Moon?
  3. 2 The Moon does not change shape
  4. 3 Waxing and waning
  5. 4 The Sun is a star
  6. 5 Eight planets, eight real distances
  7. 6 The sky can tell you north
  8. 7 What a telescope really adds
  9. 8 The big picture
  10. 9 Track quiz

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