Astronomy and Space Quiz

Grade 6 · Science · Quiz

Test your understanding of the solar system, stars, galaxies, and the vast scale of the universe.

Questions

1. How many planets are in our solar system?

   1. 7
   2. 8
   3. 9
   4. 10
   Show answer

   Answer: 8

   Our solar system has 8 planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto was reclassified as a dwarf planet in 2006.

2. Which of the following is the correct order of planets from the Sun?

   1. Mercury, Venus, Earth, Mars
   2. Venus, Mercury, Earth, Mars
   3. Mercury, Earth, Venus, Mars
   4. Mars, Earth, Venus, Mercury
   Show answer

   Answer: Mercury, Venus, Earth, Mars

   The four inner (terrestrial) planets in order from the Sun are: Mercury, Venus, Earth, Mars. A helpful mnemonic: My Very Energetic Mother.

3. What is a nebula?

   1. A type of black hole
   2. A moon orbiting a gas giant
   3. A cloud of gas and dust where stars form
   4. A small rocky body that orbits the Sun between Mars and Jupiter
   Show answer

   Answer: A cloud of gas and dust where stars form

   A nebula is an interstellar cloud of gas (mostly hydrogen) and dust. Gravity causes regions of nebulae to collapse and heat up, eventually igniting nuclear fusion to form new stars.

4. What will our Sun eventually become after it exhausts its hydrogen fuel and expands?

   1. Neutron star
   2. Black hole
   3. White dwarf
   4. Supernova remnant
   Show answer

   Answer: White dwarf

   After the Sun expands into a red giant (in about 5 billion years), its outer layers will drift away as a planetary nebula, leaving behind a dense, hot core called a white dwarf.

5. Which planet has the most prominent ring system?

   1. Jupiter
   2. Neptune
   3. Uranus
   4. Saturn
   Show answer

   Answer: Saturn

   Saturn has the most extensive and visible ring system of any planet in our solar system. Its rings are made mostly of ice and rock particles and extend thousands of kilometers.

6. What force keeps planets in orbit around the Sun?

   1. Magnetism
   2. Friction
   3. Gravity
   4. Nuclear force
   Show answer

   Answer: Gravity

   Gravity is the attractive force between objects with mass. The Sun's enormous mass creates a gravitational pull that keeps all planets, moons, and other solar system objects in their orbits.

7. The Milky Way galaxy is the only galaxy in the universe.

   Show answer

   Answer: False

   The universe contains an estimated two trillion (2,000,000,000,000) galaxies. The Milky Way is just one of them, located in a small cluster of galaxies called the Local Group.

8. The apparent change in shape of the Moon as seen from Earth throughout its orbit is called lunar ________.

   Show answer

   Answer: phases

   Lunar phases describe the changing appearance of the Moon as seen from Earth. As the Moon orbits Earth, different portions of its sunlit side are visible, creating the cycle of phases over ~29.5 days.

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