By: Keyan Suan And Brent Yee

chirpskulkInternet and Web Development

Nov 3, 2013 (3 years and 9 months ago)

99 views

By:
Keyan

Suan

And

Brent Yee


Hypothesized by Estonian astronomer Ernst
Opik

in 1932


It postulated that long
-
period

comets originated in an orbiting

cloud at the outermost edge of the

solar system.


Orbits of comets are unstable.


There are two main classes of comets:


Short period comets (ecliptic comets)


Long period comets (isotropic comets)


There is a peak in numbe
rs of isotropic
comets in the
Oort

Cloud
.



Thought to occupy a vast space from
somewhere between 2,000 and 5,000 AU


The region can be divided into a spherical
outer
Oort

cloud and a doughnut shaped
inner
Oort

cloud.



The outer cloud of the
Oort

is weakly bound
to the sun and supplies the long
-
period
comets to Neptune.


Contains several trillion objects larger than 1
km.



The inner cloud of the
Oort

is know as the
“Hills” cloud.


Named after J.G. Hills who proposed its
existence in 1981.


Models predict that it should
have tens or
hundreds of times as many c
omet nuclei as
the outer halo.


The mass of the
Oort

clou
d is not known.


The vast majority of the
O
ort

cloud is made
up of various ices such as
water, methane,
ethane, carbon monoxide
and hydrogen
cyanide.


The
Oort

cloud and Jupiter could have both
originated from a
protosolar

cloud.


Thought to be a remnant of the original
protoplanetary disc that formed around the
sun 4.6 billion years ago.


Early stars played a role in the cloud’s
formation.


The evolution of the cl
oud started from the
beginning of the solar
system and peaked
800 million years ago.


Most comets are believed to reach their
current position from the Milky Way.


Galactic tide bends and distorts orbits of
bodies in the outer solar system.


The point where gravity concedes is called
the tidal truncation radius.



Richard A. Miller postulated that a red dwarf
star or a gaseous giant planet is in orbit
ith

the
Oort

cloud.


Supposedly passes through the cloud every
26 million years.


Upon passing it bombards

the solar system with

comets.


Works
Cited"Kuiper
-
Oort
." The Nine Planets Solar System Tour.
Web. 15 Apr. 2011. <http://
nineplanets.org/kboc.html
>.



"
Oort

Cloud & Sol B?"
SolStation.com
. Web. 15 Apr. 2011.
<http://
www.solstation.com/stars/oort.htm
>.



"
Oort

Cloud." Views of the Solar System. Web. 15 Apr. 2011.
<http://
www.solarviews.com/eng/oort.htm
>.



"
Oort

Cloud." Wikipedia, the Free Encyclopedia. Web. 15 Apr. 2011.
<http://
en.wikipedia.org/wiki/Oort_cloud
>.



"Planets:
Kuiper

Belt &
Oort

Cloud." Solar System Exploration.
Web. 15 Apr. 2011.
<http://
solarsystem.nasa.gov/planets/profile.cfm?Object
=
KBOs
>.


Oort Cloud



Skip to 1:08