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Primary 5 Science · Our solar system

Name: ______________________

Date: ____________

  1. 1. How many planets orbit the Sun?

    • ☐ (a) Seven
    • ☐ (b) Eight
    • ☐ (c) Nine
    • ☐ (d) Ten

  2. 2. Which is the largest planet?

    • ☐ (a) Saturn
    • ☐ (b) Earth
    • ☐ (c) Neptune
    • ☐ (d) Jupiter

  3. 3. Which planet is closest to the Sun?

    • ☐ (a) Mercury
    • ☐ (b) Venus
    • ☐ (c) Mars
    • ☐ (d) Earth

  4. 4. Which of these is one of the small, rocky inner planets?

    • ☐ (a) Jupiter
    • ☐ (b) Saturn
    • ☐ (c) Mars
    • ☐ (d) Uranus

  5. 5. In a model where 1 AU (Earth's distance from the Sun) is 10 cm, Jupiter is 5.2 AU from the Sun. How far from the Sun should Jupiter go?

    • ☐ (a) 5.2 cm
    • ☐ (b) 52 cm
    • ☐ (c) 520 cm
    • ☐ (d) 15.2 cm

  6. 6. What object does Earth orbit?

  7. 7. Which planet is farthest from the Sun?

  8. 8. About how many days does Earth take to travel once around the Sun?

Answer sheet

  1. 1. Eight — There are eight planets. Pluto is now classed as a dwarf planet.
  2. 2. Jupiter — Jupiter is the largest planet; about 11 Earths fit across it.
  3. 3. Mercury — The order starts Mercury, Venus, Earth, Mars.
  4. 4. Mars — The rocky inner planets are Mercury, Venus, Earth and Mars.
  5. 5. 52 cm — 5.2 × 10 = 52 cm.
  6. 6. the Sun — Earth and the other planets orbit the Sun, held by its gravity.
  7. 7. Neptune — Neptune, at about 30 AU, is the eighth and farthest planet.
  8. 8. 365 days — One trip around the Sun takes about 365 14 days, which is one year.

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