Our Solar System Quiz

What percentage of the solar system's mass is contained in the Sun?

Which of the following is NOT considered a characteristic of the inner planets?

What is one of the major differences between inner and outer planets?

Which of the following celestial bodies is classified as an outer planet?

What event caused Pluto to lose its status as a planet?

What is the approximate mean radius of Earth?

Which of the following best describes the structure of the Milky Way?

What does one Astronomical Unit (AU) represent?

Which characteristic is NOT true about the outer planets compared to the inner planets?

What defines the group of celestial objects classified as galaxies?

Our Solar System

Composed of the Sun and all objects orbiting it, including planets, moons, rocks, ice, and dust.
Located near the edge of the Milky Way galaxy.
The Milky Way galaxy is a large, disc-shaped group of stars held together by gravity.
Galaxies are made up of stars of different sizes, shapes, and densities.
The Sun accounts for 99% of the solar system's mass.
One Astronomical Unit (AU) is the average distance from Earth to the Sun, approximately 150 million kilometers.

Planets

Large, spherical objects that orbit a specific area.
Rotate on their own axis.
Inner planets (terrestrial planets):
- Primarily composed of rock and metal.
- Smaller compared to outer planets.
- Either have no moons or one or two.
- Rotate relatively slowly on their axis.
- Examples: Mercury, Venus, Earth, Mars
Outer planets (Jovian or Gas Giants):
- Primarily composed of hydrogen and helium.
- Larger than inner planets.
- Many moons.
- Rings made of rock and dust.
- Examples: Jupiter, Saturn, Uranus, Neptune
Mercury and Venus do not have moons.
Pluto was reclassified as a dwarf planet in 2006.

Earth

Shape: Spheroid-shaped, slightly flattened at the poles and bulging at the equator (for mathematical purposes, an ellipsoid is used).
Mean radius: 6,371 km
Circumference at the equator: 40,075 km

Test your knowledge about our solar system, including the Sun, planets, and their characteristics. This quiz covers the basic structure of our solar system and the distinction between inner and outer planets. Challenge yourself and see how well you understand our cosmic neighborhood!