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Is Our Solar System Unique
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Why might material in clouds collapse to form stars?

What force helps clouds collapse?

Slide 12

Why might material in clouds collapse to form stars?

Why might material in clouds collapse to form stars?

What force helps clouds collapse?

gravity pulls inwards

Slide 13

If the cloud is big and cold, gravity will win out and the cloud will collapse.

If the cloud is big and cold, gravity will win out and the cloud will collapse.

gravity pulls inwards

Slide 14

The cloud is spinning.

The cloud is spinning.

What happens as it collapses?

(Think of the water in your bathtub drain)

gravity pulls inwards

Slide 15

The cloud spins faster and faster, until it canít

The cloud spins faster and faster, until it canít

support itself, and flattens out (think pizza dough)

Slide 16

Lucky for us, this is the perfect way to form a solar system.

Lucky for us, this is the perfect way to form a solar system.

blob = future sun

disk = future solar system

Slide 17

Formation basics

Formation basics

Slide 18

Formation basics

Slide 19

Ways to Find Out

Ways to Find Out

Look at our own solar system, and think about how it might have formed

Look at other solar systems while they form

Look for and study other solar systems

Create computer models and see if you can produce a solar system

Slide 20

Stars form in Dense Clouds of Dust and Gas

Stars form in Dense Clouds of Dust and Gas

What do we mean by dust? What do we mean by gas?

Slide 21

The Orion Nebula

The Orion Nebula

Slide 22

Disks really exist!

Disks really exist!

Slide 23

Disks really exist!

Disks really exist!

Slide 24

Young stars have asteroid belts and Kuiper belts

Young stars have asteroid belts and Kuiper belts

but notice how much bigger this is than the solar system!

Slide 25

In reality, disks are very hard to image.

In reality, disks are very hard to image.

Why do you think this is?

Slide 26

In reality, disks are very hard to image.

In reality, disks are very hard to image.

Why do you think this is?

So we usually use spectroscopy to study disks.

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