4th 1.2 What is a Galaxy?

What is a Galaxy?

Poll

What is a galaxy?

• a chocolate

• a phone

• a group of celestial bodies

• a cellphone model

Actually, all of them are correct!

But we are going to focus on one of them

After the Big Bang, the Universe was created.

Galaxies took billions of years to form.

Galaxies are formed by stars, planets and other celestial bodies

This is our galaxy: the Milky Way

Multiple Choice

The Universe was created after the Big Bang.

• True

• False

Multiple Select

Galaxies are formed by:

• Water

• Planets

• Sand

• Stars

Did you know there are different types of galaxies?

Poll

How many types of galaxies do you think there are?

• 2

• 3

• 4

• 5

There are three mayor types of galaxies

Spiral Galaxies

• A center of old stars

• Two or more 'arms' going around

• The Milky Way is a spiral galaxy

Elliptical Galaxies

• A center of old stars

• Young stars around them

• Looks like a circle or oval

Irregular Galaxies

• They don't have a definite shape

• They don't have a center

• They are not very common

Let's recall!

Multiple Choice

These galaxies have young stars around them

• Spiral

• Elliptical

• Irregular

Multiple Choice

These galaxies are shaped like circles or ovals

• Spiral

• Elliptical

• Irregular

Multiple Select

These galaxies have a center of old stars

• Spiral

• Elliptical

• Irregular

Multiple Choice

These galaxies have no center or definite shape

• Spiral

• Elliptical

• Irregular

Multiple Choice

What shape is our galaxy, the Milky Way?

• Spiral

• Elliptical

• Irregular

Create your own galaxy!

https://www.youtube.com/watch?v=N74RnWWpdG4