Gravity in the Galaxies

Gravity attracts objects towards one another

• True

• False

Gravity is based on an object's _____________.

• roundness

• brightness

• appearance

• mass

What keeps the planets in orbit around the sun?

• stars

• heat

• gravity

• satellites

Why do the planets in our solar system orbit the sun?

• because the sun is the brightest

• because the sun was there first

• because the sun has the most mass

• because nothing can orbit planets

What is true about the dark areas of the night sky?

• Black holes make up the dark areas of the sky

• Objects in the dark areas of the sky are too far to be seen

• There is nothing located in the dark areas of the sky

• Objects in the dark areas are moving too fast to be seen

This is the word that describes space and all the matter and energy in it.

• universe

• space

• solar system

• sun

Which of the following is the largest?

• cluster

• solar system

• star

• galaxy

Gravity is the force objects put on each other because of their ____________.

• speed

• mass

• direction

• location

Why is the Earth and other planets spherical?

• erosion from asteroids hitting the surface

• heat from the sun melted the object's surface

• force of gravity is acting evenly in all directions around the center mass

• pressure of the atmosphere acting evenly in all directions

What would happen if the mass of one object suddenly increased?

• The mass of the other object would increase

• The distance between the objects would increase

• The gravitational force of the objects would remain constant

• The gravitational force between 2 objects would increase