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Neptune Answer Key

Neptune is known as Earth's twin.
  1. True
  2. False
Neptune has winds exceeding 1,000 kilometers per hour.
  1. True
  2. False
A day on Neptune is longer than a day on Earth.
  1. True
  2. False
At times, Neptune is further from the Sun than Pluto.
  1. True
  2. False
How would the force of gravity between Neptune and the Sun be affected if Neptune were closer to the Sun?
  1. The force between the two would be less.
  2. The force between the two would be greater.
  3. The force between the two would disappear.
  4. The force between the two would not change.
What is the substance that most likely makes up Neptune's upper cloud layer?
  1. water droplets
  2. ice crystals
  3. frozen carbon dioxide
  4. frozen methane
                is the largest of Neptune's moons.
  1. Nereid
  2. Despina
  3. Proteus
  4. Triton
About how many Earth years does it take Neptune to orbit the Sun?
  1. 16
  2. 160
  3. 1,600
  4. 16,000
What spacecraft passed by Neptune in 1989?
  1. Viking 1
  2. Viking 2
  3. Voyager 1
  4. Voyager 2
Which statement about Neptune is true?
  1. Neptune has a ring system.
  2. Neptune has five known moons.
  3. Neptune is made entirely of gas.

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