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View Full Version : How far, when and in what section of the oorb debris are we being surrounded



Achak
2010-Apr-03, 11:52 PM
Salutations to all,

How can I perceive well earth position in relation to Oort debris and to wich specific section of it ??

Thank you

Achak

grant hutchison
2010-Apr-03, 11:57 PM
The Oort cloud is all around us: a spherical region surrounding the solar system.

Grant Hutchison

grapes
2010-Apr-04, 12:12 AM
Plus, it doesn't move that fast, whereas we go around the sun once a year.

Achak
2010-Apr-04, 12:59 AM
Thank you,

So why some medias in different Cultures and languages are relaying the infos that there is an upsurge of debris ?

Van Rijn
2010-Apr-04, 01:08 AM
Thank you,

So why some medias in different Cultures and languages are relaying the infos that there is an upsurge of debris ?

Could you give some examples of what you are talking about? What "debris" are you referring to?

The main argument for the existence of an Oort cloud are the orbits of long period comets. I'm not aware of any upsurge of those.

grapes
2010-Apr-04, 01:17 AM
So why some medias in different Cultures and languages are relaying the infos that there is an upsurge of debris ?

I did not know that. Do you have a link?

Achak
2010-Apr-04, 01:33 AM
First the Succes of China in destruction of space junk, then the U.S. did the same.
There are new space mobile and efficient vehicules. Rockwell X-30 B and apparently unique.
http://en.wikipedia.org/wiki/Rockwell_X-30

Then Professor Napier theory;

Was A Giant Comet Responsible for North American Catastrophe in 11,000 BC?
http://www.spaceref.com/news/viewpr.rss.html?pid=30508

On Professor Napier theory from Wthe wiki
http://en.wikipedia.org/wiki/Bill_Napier

Achak
2010-Apr-04, 01:45 AM
Oort Cloud - vast encircling envelope of comets around the Sun. Has a spherical distribution.

Orbits > 200years. Composition - ice and rocky debris (dirty snowball) ....

http://www.google.ca/url?sa=t&source=web&ct=res&cd=1&ved=0CAYQFjAA&url=http%3A%2F%2Fsiogeoscience.ucsd.edu%2Fundergra d%2Fdocs%2FESYS150_08_lect18.ppt&ei=7e63S8abBoT58Abc14nfBw&usg=AFQjCNGwl5xdkY18i02naCrjWkFcukiX5Q&sig2=iNr-o7cTQk5KNwVE-XMfDQ

Achak
2010-Apr-04, 01:46 AM
We can remember debris crashing on the Sun and Jupiter.

Van Rijn
2010-Apr-04, 01:55 AM
First the Succes of China in destruction of space junk, then the U.S. did the same.


The "space junk" in both those cases were human made spacecraft in Earth orbit. This had nothing to do with Oort cloud debris, nor could the anti-satellite missiles used have any useful effect on comets.



There are new space mobile and efficient vehicules. Rockwell X-30 B and apparently unique.
http://en.wikipedia.org/wiki/Rockwell_X-30


Again, I see nothing here that has to do with Oort cloud debris.

By the way, that program was canceled.



Then Professor Napier theory;

Was A Giant Comet Responsible for North American Catastrophe in 11,000 BC?
http://www.spaceref.com/news/viewpr.rss.html?pid=30508

On Professor Napier theory from Wthe wiki
http://en.wikipedia.org/wiki/Bill_Napier

There is quite a bit of debate on whether there was any impact in this case at all. Even if there was, it wouldn't signify an increase of comets from the Oort cloud, or that the object was from the Oort cloud.

grapes
2010-Apr-04, 01:56 AM
Which part is the "upsurge"?

Achak
2010-Apr-04, 01:56 AM
2010 compilation at
http://fireballs-meteorites.blogspot.com/

01101001
2010-Apr-04, 02:02 AM
2010 compilation at
http://fireballs-meteorites.blogspot.com/

Title: Night becomes day as fireball lights up skies over Hungary

No Oort Cloud "upsurge" involved.

Achak
2010-Apr-04, 02:11 AM
The sudden upsurge is a subjective observation from Latino medias, the Chile event.
In the Francophone world it seems quiet
But in India it is something else.

once an event, twice a pattern, thrice a program

Van Rijn
2010-Apr-04, 02:12 AM
We can remember debris crashing on the Sun and Jupiter.

We have telescopes and spacecraft that lets us see more than we used to.

So far, you haven't presented any articles arguing for an "upsurge," or any evidence for it.

Achak
2010-Apr-04, 02:17 AM
Could it be only our perceptions that is more precise and aware than before excluding any change in our Spatial Environment ?

Van Rijn
2010-Apr-04, 02:33 AM
Could it be only our perceptions that is more precise and aware than before excluding any change in our Spatial Environment ?

Yes. Impacts on Jupiter, for example, would have gone unnoticed until quite recently. Note that Jupiter is a bigger target than Earth, and is more likely to get impacts than Earth.

Regarding fireballs, there are many examples in historical records, but today they are more likely to be noted, just because it is easier.

astromark
2010-Apr-04, 02:33 AM
Achak; It could be argued that in fact the frequency of Earth impactors has and is dropping... With each and every object now being mapped we have a better data base than at any previous time.. We know more. And can reason that as each orbiting body continues to clear its path of debris we reap the reward... Jupiter and Saturn do sweep up some of the objects that could have become 'issues ' for Earth.

Achak
2010-Apr-04, 02:36 AM
Thank you all

grapes
2010-Apr-04, 03:07 AM
Yes. Impacts on Jupiter, for example, would have gone unnoticed until quite recently. Note that Jupiter is a bigger target than Earth, and is more likely to get impacts than Earth.And the Shoemaker-Levy impacts weren't Oort Cloud, right? At least, recently.

Thank you allYou're welcome. It's an interesting thing to think about.

Jeff Root
2010-Apr-04, 03:14 AM
Reasons for increasing numbers of reports of things seen in the sky include
increasing world population; increasing human activities at night; cell phones;
compact digital cameras; continuously-operating surveilance cameras; and
the Internet. All make it more likely that something will be seen, recorded,
reported, and heard about by others who are interested.

A particularly interesting category of continuously-operating surveilance
cameras is the orbiting system of US Department of Defense satellites which
watch for nuclear explosions or missile launches. They can see large meteor
fireballs anywhere in the world.

-- Jeff, in Minneapolis

DrRocket
2010-Apr-04, 03:59 AM
The Oort cloud is all around us: a spherical region surrounding the solar system.

Grant Hutchison
http://www.nineplanets.org/kboc.html
http://en.wikipedia.org/wiki/Oort_cloud
http://solarsystem.nasa.gov/planets/profile.cfm?Object=KBOs&Display=OverviewLong

Van Rijn
2010-Apr-05, 09:43 PM
And the Shoemaker-Levy impacts weren't Oort Cloud, right? At least, recently.


Yes, that was in Jupiter orbit before it hit. Though I don't think it is as clear what was the cause of the more recent impact. (http://www.jpl.nasa.gov/news/news.cfm?release=2009-112). Most likely it wouldn't be something from the Oort cloud, but I don't know if that can be ruled out.

By the way, I noticed this article, which might interest folks here:

Collisional Probability of Periodic Comets with the Terrestrial Planets: An Invalid Case of Analytic Formulation (http://iopscience.iop.org/1538-3881/115/2/848/)

There are both HTML and PDF versions of the full article available from that link. It gives some numbers to estimates of impact rates.

astromark
2010-Apr-06, 12:54 AM
Thanks 'Van Rijn' great info link.. we are informed...