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How did the Solar System form
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Slide 35

Why canít we make a huge computer simulation to explain everything?

Why canít we make a huge computer simulation to explain everything?

How do you design a computer simulation?

Slide 36

What models would you create?

What models would you create?

Slide 37

How did the Solar System form

Slide 38

A model of planets

A model of planets

growing in a disk.

Slide 39

How did the Solar System form

Slide 40

How did the Solar System form

Slide 41

Some things weíve learned from models:

Some things weíve learned from models:

Our basic theory holds up pretty well, but .

Itís hard to get little particles to stick to each other when

they collide.

It takes a really, really long time to make planets (maybe

too long??)

Itís hard to form planetary systems as flat as ours.

Slide 42

Solar System Formation: Take-away messages

Solar System Formation: Take-away messages

Solar system formation begins because of gravity - most stuff ends up in the sun

A disk is formed because of rotation

Planet cores form in the disk because rocks hit and/or gravitationally attract each other

If thereís ice around (> 5 AU from the star, where itís cold) the cores are bigger. If big enough, theyíll suck gas out of the disk and form giant planets

Moons form via collision or capture or in mini disks

Theory:

Observations generally agree with theory, but itís hard to see details. They also

show us that stars and disks are all very different from each other. And, they

gave us the surprising observation of outflows.

Simulations also agree with theory, but they canít model everything at once, and

there are some problems (things take too long, for one)

Slide 43

Is our solar system unique?

Is our solar system unique?

Are there other Earth-like planets, or are we a fluke?

Under what conditions can Earth-like planets form?

Is life common or rare?

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