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The Formation of Our Solar System
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Crust eventually forms from lightest material

Slide 21

Planetary Interiors

Planetary Interiors

Differentiation

Continues!

Radioactive decay = primary heat source

Partial melting of mantle material  rising magma  volcanoes / lava flows

Slide 22

Pause to recall the Play Doh accretion activity

Pause to recall the Play Doh accretion activity

But wait, there’s more ….

We can differentiate!

Slide 23

When did Our Solar System Form … How do We Know?

When did Our Solar System Form … How do We Know?

Image: Lunar and Planetary Laboratory:

Slide 24

When Did the Solar System Form?

When Did the Solar System Form?

4.56 billion years ago

How do we know? (evidence for formation)

Meteorite photo by Carl Allen at

Lunar samples - 4.5 to 4.6 Ga

Meteorites - 4.56 Ga

Earth – 3.9 (or 4.4 Ga)

Lunar meteorite at

Slide 25

How Do We Know How Our Solar System Formed?

How Do We Know How Our Solar System Formed?

Slide 26

Solar System Samples Meteorites

Solar System Samples Meteorites

Slide 27

Earliest history of Solar System - chemical and physical info about formation and building blocks of planets (rest of stuff was pulled into the Sun or other planets….)

Earliest history of Solar System - chemical and physical info about formation and building blocks of planets (rest of stuff was pulled into the Sun or other planets….)

Sample Return

1/15/2006

Stardust

Passed through Comet Wild 2 Coma 1/2004

Stardust image at

Slide 28

We Can Also Look Around ….

We Can Also Look Around ….

Close-up of "Proplyds" in Orion

Thanks Hubble!

Hubble images at

Slide 29

Comets

Comets

Dirty snowballs - small objects of ice, gas, dust, tiny traces of organic material

Slide 30

Comet Parts

Comet Parts

Nucleus, Coma

Dust tail – white, “smoke,” reflects sun. 600,000 to 6 million miles long

Ion tail – Solar UV breaks down CO gas, making them glow blue. 10’s of millions of miles

Slide 31

Naming Comets

Naming Comets

NASA/ JPL image of Comet Halley at

Slide 32

Where do Comets Originate?

Where do Comets Originate?

Slide 33

What’s in a Tail?

What’s in a Tail?

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