... system birth, which supposes that planets accrete from

1
Origin of the Solar System
Spiral Galaxy
Star Birth, Orion Nebula
Beta Pictoris
Solar Nebula
2
Formation of the Universe
3
(No Transcript)
4
Origin of the Solar System
Historically there have been two competing
classes of hypotheses for origin of the solar
system.   1. Dualistic or Encounter
Hypothesis Le Clerc (Comte de Buffon) in
1745 T.C. Chamberlain in early 20th century   2.
Nebular Hypothesis Descartes 1644 Immanuel Kant
1755 Laplace 1796
5
Dualistic Hypothesis
6
Nebular Hypothesis
7
Beta Pictoris is a young star about 20 million
years old that is located 63 light years away.
Beta Pictoris
This false-color image of the disk surrounding
Beta Pictoris was obtained at the European
Southern Observatory by blocking direct starlight
and imaging the near-infrared light from the
disk.
8
At the heart of the Orion Nebula lies a complex
of molecular clouds where abundant star formation
is occurring today. The clouds are illuminated
by a flood of ultraviolet light emitted by four
bright stars, collectively called the Trapezium.
More than 150 protoplanetary disks have been
found in this mosaic of HST images.
Orion Nebula, giant stellar nursery 1600 light
years away
9
At the center of each proplyd (protoplanetary
disk) is a T Tauri star. The disks surrounding
them are two to eight times the diameter of our
solar system.
10
(No Transcript)
11
Solar Nebula with Bipolar Outflow
12
Nucleosynthesis
13
Nucleosynthesis
Our Suns fusion only creates He, need red giant
for heavier elements.
14
Chart of the Nuclides
15
Nucleosynthesis
Elements heavier than Fe created by s- and
r-processes in a supernova
16
Interplanetary Dust Grain
In this scanning electron microscope image, all
the minerals, organic compounds, and amorphous
materials look the same. However, isotopic
analysis reveals that some components of this
dust actually solidified in interstellar space
long before our Sun and its planets formed.
17
In-falling interstellar gas and dust is focused
inward towards the proto-sun.
18
Chondrules formed from melted dust grains that
were flash-heated in the inner solar nebula.
19
Planetesimal Growth
20
Proto-planet Formation
21
Temperature in the Solar Nebula
22
The Solar System
23
Terrestrial Planets
Mercury, Venus, Earth, Mars
24
Terrestrial Planets
25
Giant Planets
Jupiter, Saturn, Uranus, Neptune
26
Giant Planets
27
Habitable Zone in our Solar System
28
(No Transcript)
29
(No Transcript)