Social Science - Unit 1

What is a galaxy?

• a large group of stars held together by gravity

• a system of planets and its moons

• a system of planets orbiting a star

• a group of comets

Choose the correct order from biggest to smallest

• Galaxy - Universe - Solar system

• Universe - Solar System - Galaxy

• Universe - Galaxy - Solar system

• Solar System - Uinverse - Galaxy

The Milky Way is an example of...

• System

• Spiral Galaxy

• Planet

• Nebula

How is the theory of the creation of the Universe called?

Which statement correctly describes the theory of the "Big Bang"?

• The universe is in an unchanging steady state.

• The universe is composed of only energy and no matter.

• All matter and energy once exploded out of a single point.

• Little explosions happen all over the universe creating matter and energy.

Sphere of gas that emit light and energy

A giant cloud of gas and dust located between stars

Our Solar System is located in a galaxy called...

The central star of our system

The Moon is a natural _________ of the Earth