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Ninth Grade (Grade 9) Solar System Questions

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Grade 9 Planetary Motion
How long does it take earth to complete one revolution?
  1. 29.5 days
  2. 365.25 days
  3. 24 hours
  4. 72 hours
Grade 9 Inner Planets
When the solar system formed, which planets lost most of their gases to the sun?
  1. the inner planets
  2. the comets
  3. the outer planets
  4. the asteroids
Grade 9 Sun
Grade 9 Outer Planets
What is the name of the region where icy bodies that lie beyond Neptune's orbit?
  1. The Kuiper Belt
  2. The Oort Cloud
  3. The Outer Asteroid Belt
  4. All of the Above
Grade 9 Planetary Motion
Grade 9 Planetary Motion
Grade 9 Outer Planets
Io is a moon of
  1. Mars
  2. Venus
  3. Jupiter
  4. the moon
Grade 9 Planetary Motion
The gravitational attraction between sun, moon, and Earth
  1. causes tides
  2. causes seasons to change
  3. causes a full moon
Grade 9 Inner Planets
Grade 9 Small Bodies and Dwarf Planets
Which of the following is NOT a possible source of meteoroids?
  1. solid remains of comets that once traveled near Earth's orbit
  2. gassy ices that were not incorporated into the planets
  3. material from the asteroid belt
  4. interplanetary rocks and metals that was not incorporated into the planets
Grade 9 Outer Planets
What elements largely make up Neptune's atmosphere?
  1. Helium and Hydrogen
  2. Nitrogen and Oxygen
  3. Oxygen and Sulfur
  4. Sulfur and Helium
Grade 9 Inner Planets
Select the letter of Mercury's position in the solar system.
  1. innermost terrestrial planet
  2. innermost Jovian planet
  3. outermost terrestrial planet
  4. outermost Jovian planet
Grade 9 Planetary Motion
One day on Mercury is equal to about 59 Earth days. Which statement best explains this phenomena?
  1. Mercury rotates slower than the Earth
  2. Mercury revolves faster than the Earth
  3. Earth is farther from the Sun than Mercury
  4. Earth has a lower orbital eccentricity than Mercury
Grade 9 Planetary Motion
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