Galaxies

Page 25

3+ Questions

I. What is a Galaxy?

Galaxy: A grouping of billions of stars and

other matter held together by gravity

Asteroids, planets, stars, gas, moons, dust,

life, nebulas, black holes, manmade things,

rocks, gravity, red giants, comets, water,

light

There are many galaxies in the universe

II. Galaxy Names

Galaxies are named based on their shape.

Spiral, Elliptical, Irregular

Spiral Galaxy

The most common

type of galaxy

Have a lot of dust,

and hot, bright, young

stars.

Brightest Galaxies

Spiral around center

Andromeda Galaxy

Spiral Galaxy on its side

Elliptical Galaxy

Usually circular or

oval

Reddish -colored

Lack gas and dust for

new star formation

Elliptical Galaxy about 450 million light

years away

Thought to be as massive as 100 billion of

our suns

Irregular Galaxies

No definite shape

Chaotic clusters of

stars

Possibilities:

Two Galaxies Collide

Very young galaxies

that haven't yet

become symmetrical

Large and Small Magallenic Cloud. Third Closest galaxy to

Milky Way. 1/10 mass as Milky Way.

Another irregular galaxy

When galaxies collide- Here are some

actual Hubble pictures of galaxies that are about to, are colliding,

or will soon collide.

Colliding Galaxies.wmv

Hubble Video of Colliding Galaxies- Click on the black

box to play

III. Our Galaxy

Milky Way Galaxy

Spiral galaxy

Artist’s drawing of our galaxy, MW, if seen from above.

Can you find the sun?

SummaryThere are ____ types of Galaxies in our

Universe. The most common galaxies are

__________. (Explain what they look like and how they

are made) Next, there are the older

galaxies,____________ (Explain what they look like

and are made of) Finally, there are the youngest

galaxies, _____. (Explain what they look like and are

made of) We live in the Milky Way, which is a

_______ Galaxy.