Universe/Solar System Study Guide 1 24 25

What is the former model of our solar system?

• Heliocentric model

• Geocentric model

• Planetary model

• Star-centered model

What is Newton’s law of gravity?

• Objects with more mass attract objects with less mass.

• Every mass attracts every other mass with a force proportional to their masses and the square of the distance between them.

• Gravity only works on large planets.

• Gravity is stronger on colder objects.

The force of gravity depends on what 2 factors?

• Shape and size of the object

• Mass and distance between the objects

• Temperature and density of the object

• Speed and acceleration of the objects

What is a light year?

• The time it takes light to travel around the Sun.

• The distance light travels in one year.

• The distance light travels in one month.

• A unit of time.

How many stars are in our solar system?

• 1

• 2

• 3

• 8

Which of the following is a property of terrestrial planets?

• Made mostly of gas

• Rocky surfaces

• Many moons

• Very large in size

Which planet would you weigh the most on?

• Venus

• Earth

• Saturn

• Jupiter

What is the force of gravity determined by?

• The shape of an object

• The mass of the object and the distance between objects

• The temperature of the object

• The color of the object

Which 2 factors combine to keep planets in orbit around the Sun?

• Wind and pressure

• Gravity and inertia

• Magnetic fields and rotation

• Mass and density

What type of galaxy is the Milky Way?

• Elliptical

• Spiral

• Irregular

• Circular