Unit 4: Properties of Objects in the solar system

Which of the following best explains why a planet is round and stays in orbit around the Sun?

• The planet's own gravity keeps it round, and the Sun's gravity keeps it in orbit.

• The gravity between planets keeps them round, and the Sun's gravity keeps them in orbit.

• The planet's own gravity keeps it round, and the Sun's magnetism keeps it in orbit.

• The gravity between planets keeps them round, and the Sun's magnetism keeps them in orbit.

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How do scientists think gravity helped form our Solar System?

• The planets pulled the Sun into the center of our Solar System.

• The Sun pulled planets from another solar system into its orbit.

• Other solar systems pushed our planets into place.

• Gravity made dust particles stick together to form planets around the Sun.

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Why is Venus hotter than Mercury, even though Mercury is closer to the Sun?

• Venus has a thicker atmosphere.

• Venus has a thinner atmosphere.

• Venus orbits the Sun faster.

• Venus orbits the Sun slower.

How does a planet's distance from the Sun affect its properties?

• Planets farther from the Sun have thicker atmospheres.

• Planets farther from the Sun have smaller masses.

• Planets farther from the Sun have stronger gravity.

• Planets closer to the Sun orbit faster.

How are the heliocentric and geocentric models of the Solar System different?

• The Sun is at the center in one model, and the Earth is at the center in the other.

• The planets orbit in circles in one model, and in ovals in the other.

• One model is older than the other.

• One model is based on math, and the other is based on observation.

Which of the following statements correctly compares the gravitational pull of Earth to other objects within the Solar System?

• Mars has a stronger gravitational pull than Earth.

• Earth has a stronger gravitational pull than Uranus.

• Earth has a stronger gravitational pull than Neptune.

• The Moon has a stronger gravitational pull than Earth.

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Imagine you're an astronaut observing the planets in our solar system. Which planets would you expect to see moving the fastest across the sky?

• Planets closest to the Sun.

• Planets farthest from the Sun.

• Planets with a thin atmosphere.

• All planets move at the same speed.

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NGSS.MS-ESS1-2

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Imagine you're a space explorer studying the planets in our solar system. You're interested in finding the coldest planet. Based on the information provided, which planet would you expect to have the lowest average surface temperature?

• Mars

• Earth

• Jupiter

• Saturn

Imagine you're an astronaut observing the planets in our solar system. How does gravity influence the way these planets move?

• The planets move at the same speed.

• The planets' motion is not affected by gravity.

• The planets revolve along different orbital paths.

• The planets move at equal distances from the Sun.

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Imagine you're a scientist studying the formation of our solar system. How did gravity contribute to the process of planet formation?

• Gravity pulled apart large particles, creating smaller particles that formed the planets.

• Gravity caused particles to rotate and spin, forming a nebula that eventually became the planets.

• Gravity attracted small particles together, causing them to merge and grow into larger particles that eventually formed planets.

• Gravity caused the solar nebula to collapse inward, heating it up and allowing planets to form.

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