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What unit of measurement do scientists use when measuring distances inside the solar system?

• miles

• light years

• astronomical unit

• inches

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What unit of measurement do scientists use when measuring distances between galaxies?

• miles

• astronomical units

• light years

• feet

Which object contains most of the mass of the universe?

• black holes

• dark matter

• gas and dust

• stars

Which of the following best describes Earth's specific location in space?

• within a solar system

• in a cluster of galaxies

• at the edge of a supercluster

• at the center of a spiral galaxy

Which of the following best describes the hierarchical relationship between the Earth and the Milky Way galaxy?

• The Earth is a part of the Milky Way galaxy, which is a part of the solar system.

• The Earth is a planet in the solar system, which is part of the Milky Way galaxy.

• The Earth is a galaxy that contains the solar system.

• The Earth is a solar system that contains the Milky Way galaxy.

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Which of the following statements correctly distinguishes between a solar system and a galaxy?

• A solar system is a collection of galaxies, while a galaxy is a collection of stars.

• A solar system is a collection of stars, while a galaxy is a collection of planets.

• A solar system is a collection of planets orbiting a star, while a galaxy is a collection of solar systems.

• A solar system is a collection of galaxies, while a galaxy is a collection of planets orbiting a star.

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Which of the following best describes the relationship between the solar system and the universe?

• The solar system is larger than the universe.

• The solar system is a part of the universe.

• The universe is a part of the solar system.

• The solar system and the universe are the same size.

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When comets come close to the Sun they develop a tail that glows, and we can see it from Earth. Asteroids do NOT develop tails like this. In what OTHER way are asteroids different from comets?

• Asteroids orbit planets, while comets orbit the Sun.

• Asteroids are rocky, while comets are balls of ice and dust.

• Asteroids orbit outside of the Solar System, while comets do not.

• Asteroids are smooth and round, while comets are lumpy shapes.

If you were to arrange the following astronomical bodies by size from smallest to largest, which order would be correct?

• Galaxy, Solar System, Planet

• Planet, Solar System, Galaxy

• Solar System, Planet, Galaxy

• Planet, Galaxy, Solar System

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How would you use reasoning to explain the difference in composition between a planet and a star?

• Planets are primarily composed of gases, while stars are composed of solid materials.

• Planets are composed of solid and liquid materials, while stars are primarily composed of gases undergoing nuclear fusion.

• Planets and stars have the same composition but differ in size.

• Planets are composed of ice, while stars are composed of water.

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