Unit 4: Properties of Objects in the solar system

Grace, Zoe, and Arjun are stargazing and wonder why planets are round and how they stay in orbit around the Sun. Which of the following best explains this cosmic mystery?

• 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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Imagine Sophia, Benjamin, and Henry are space detectives trying to solve the mystery of how our Solar System was formed. How do scientists think gravity played a role in this cosmic creation?

• 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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Jackson and Scarlett are having a space debate! Jackson thinks Mercury should be the hottest planet since it's closest to the Sun, but Scarlett says Venus is actually hotter. Who's right, and 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.

Benjamin, Michael, and Grace are curious about the planets in our solar system! They wonder: 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.

Abigail and Samuel are having a friendly debate about the Solar System! Abigail thinks the Sun is at the center, while Samuel believes the Earth is at the center. 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.

Henry, Charlotte, and David are curious about how strong gravity is on different planets! If you could jump from planet to planet, 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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Maya, Arjun, and Elijah are on a space adventure, gazing out of their spaceship at the planets in our solar system. Which planets do you think they would see zipping across the sky the fastest?

• 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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Ava, Oliver, and Mia are on a thrilling space adventure, exploring the planets in our solar system! They want to discover which planet is the chilliest of them all. Based on what you know, which planet would you expect to have the lowest average surface temperature?

• Mars

• Earth

• Jupiter

• Saturn

Imagine you're an astronaut, like Aria or James, floating in space and watching the planets dance around the Sun. How does gravity act as the invisible force that guides 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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Mia, Priya, and Ava are on a cosmic adventure, pretending to be scientists exploring how our solar system formed. As they watch dust and rocks floating in space, they wonder: how did gravity help turn all those tiny particles into the planets we know today?

• 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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