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Galaxies. The Milky Way Galaxy.  The Milky Way is shaped like a disk with a bulge in the center  You cannot see the center of the galaxy because it is hidden by dust  The disk of the Milky Way measures more than 100,000 light years in diameter. The Milky Way Galaxy.

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Galaxies


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the milky way galaxy
The Milky Way Galaxy

The Milky Way is shaped like a disk with a bulge in the center

You cannot see the center of the galaxy because it is hidden by dust

The disk of the Milky Way measures more than 100,000 light years in diameter

the milky way galaxy1
The Milky Way Galaxy

The Milky Way contains clouds of gas and dust called nebulae

The galaxy is so large that the Sun takes about 250 million years to complete one orbit

types of galaxies
Types of Galaxies

Spiral Galaxies

Have arms of

stars, gas, and

dust that curve

away from the

center of the

galaxy in a

spiral pattern

types of galaxies1
Types of Galaxies

These galaxies are

disk-shaped and

have a central bulge

Most of the stars in

the disk and bulge

are old stars – the

dense arms within

the disk contain

many young, bright

stars

types of galaxies2
Types of Galaxies

Elliptical Galaxies

Shaped like

spheres or eggs

These galaxies

have almost no dust

or gas between

stars, and all of their

stars are old

types of galaxies3
Types of Galaxies

Irregular Galaxies

Faint galaxies without

a definite shape

They are smaller

than the other types

of galaxies and

have many fewer

stars

types of galaxies4
Types of Galaxies

Galaxies sometimes

collide with other

galaxies – these

collisions can cause

changes in their

shapes

center of galaxies
Center of Galaxies

Most large galaxies seem to have supermassive blackholes at their centers

Astronomers can identify the presence of a black hole by the behavior of matter around it

center of galaxies1
Center of Galaxies

The gravity of a

supermassive black hole

is so strong that it draws

in a huge, whirlpool of

gas from nearby stars

The motions of stars

orbiting the black hole

can also reveal its

presence

center of galaxies2
Center of Galaxies

The very bright

centers of some

distant galaxies are

called quasars – the

galaxy surrounding a

quasar is often hard

to see because the

quasar is so much

brighter than it