Solar System Essentials

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1. Which planet orbits closest to the Sun?

   • Mercury
   • Venus
   • Earth
   • Mars

2. The prominent rings visible around which planet are made mainly of ice particles, with some rock and dust?

   • Mars
   • Neptune
   • Saturn
   • Venus

3. Which planet is the largest in our solar system?

   • Saturn
   • Jupiter
   • Neptune
   • Earth

4. Earth takes about how long to complete one orbit around the Sun?

   • 24 hours
   • 30 days
   • 12 years
   • 365 days

5. Why does Mars look reddish when viewed from Earth?

   • Its clouds reflect red sunlight
   • Iron minerals in its soil have oxidized
   • Its surface is covered by red plants
   • Lava continuously glows on its surface

6. What primarily keeps planets moving in orbit around the Sun?

   • Solar wind
   • Magnetic attraction
   • The Sun’s gravity
   • Pressure from sunlight

7. Where is the main asteroid belt located?

   • Between Mars and Jupiter
   • Between Earth and Mars
   • Beyond the Kuiper Belt
   • Between Mercury and Venus

8. Which statement correctly distinguishes a planet from a typical comet?

   • Only planets orbit the Sun
   • Comets are always found beyond Neptune
   • Planets contain no ice
   • A comet can form a coma and tails when it nears the Sun

9. Why is Venus hotter at its surface than Mercury even though Mercury is closer to the Sun?

   • Venus rotates more quickly
   • Mercury reflects all incoming sunlight
   • Venus has a dense carbon-dioxide atmosphere that traps heat
   • Radioactive decay is much stronger on Venus

10. Pluto is classified as a dwarf planet mainly because it has not met which planetary criterion?

    • It does not orbit the Sun
    • It has not cleared its orbital neighborhood
    • It has no natural satellites
    • It is not nearly round