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Fraser
2005-Feb-15, 05:57 PM
SUMMARY: With all the recent news about asteroids and comets, I figure you've got a lot of questions. Well, now's your chance to get some answers. We've lined up astronomer Dr. David J. Tholen, a professor at the University of Hawaii, Institute for Astronomy who specializes in the search for Earth-crossing asteroids. Once again, visit the forum, post your questions for David, and we'll pick through and send him some zingers. I'll publish his answers in an upcoming issue of Universe Today.

Click here to visit the forum and post your question.

Thanks!

Fraser Cain
Publisher
Universe Today

What do you think about this story? Post your comments below.

Erimus
2005-Feb-15, 06:26 PM
Cool topic! :lol:

My questions:

1.) Which class of Earth-crossing asteroids do you find most interesting, Atens or Apollos?

2.) Which particular NEO do you find most interesting?

3.) Are the numbers of Earth-crossing asteroids of each major composition (stony, iron, stony-iron, and carbonaceous) probably represented equally in our record of meteorite statistics?

4.) Are there many carbonaceous Earth-crossing asteroids, or are most silicates or irons?

Thanks much for your time! :)

Fred from Kalamazoo
2005-Feb-15, 07:54 PM
Are leading scientists finally giving up on the Oort Cloud theory or is this something we are still struggling to substantiate?

Brian Eckels
2005-Feb-15, 08:19 PM
I dont know if my question is relevant to your field or research, but I was curious about the methods used to detect objects that (a) have a comparatively large orbit that might cross Earth's orbit at an interval of 200+ years, and (b ) detection of those objects that approach from the sun at an angle that would make visual detection difficult.

ebaber19
2005-Feb-15, 09:04 PM
Great topic!!
My question: What is the maximum size that body such as an asteroid can maintain its irregular shape, i.e. before gravity crushes it into a sphere. Thank you in advance

Bluewolf027
2005-Feb-15, 10:24 PM
Assumming that what I read in this story is true

Giant asteroid will narrowly miss earth (http://news.independent.co.uk/world/science_technology/story.jsp?story=611219)

If asteroid 2004 MN4 is really going to pass within 36000kms of earth...

Is it possible for the earth or the moons gravity to affect the orbit of the asteroid changing its path enough to hit either body (the earth or the moon)?

imported_Carl
2005-Feb-15, 11:36 PM
Will it be possible to safely bring back an asteroid or pieces of several to earth?

Z28Jerry
2005-Feb-15, 11:43 PM
With the recent news of a future asteroid coming very close to Earth, I can't help but wonder:

Would it be possible to capture a NEO such as this and turn it into a "natural" satellite to mine and have bases on? It would be closer than the moon, making a semi-permanent space station WAY more economical. Thoughts?

Jerry

Fari
2005-Feb-16, 12:11 AM
:) Hi How are you..

May be my questions are too simple and less scientific, but I think it is important to know.. What is the impact to the Earth, when the asteroid crossing the Earth? will it changes the weather or gives any chemical or other effects? have we prepared for that ? should ordinary people know and be aware of it?

Thank you :rolleyes:

Guest_SeanO
2005-Feb-16, 01:01 AM
What do you believe the chances are that the earth will be hit by an asteriod/comet that could cause world wide devastation within our lifetime?

Guest
2005-Feb-16, 09:41 AM
The Near Earth Objects we know of seem to represent a significant resource in space, not too far from our own orbit.
Do you have any speculations you could share with us about the exploitation of these objects, especially the sort of required technologies and favoured strategies required?
What elements and compounds are likely to be present- for instsnce what is the typical water ice content?
As I understand it, there are several different classes of asteroid with different compositions; are there representatives of all these classes in near Earth orbit, and which would be the most commercially valuable?

eburacum45
2005-Feb-16, 09:42 AM
Logging in to claim previous post...

Andy-Nimmo
2005-Feb-16, 10:54 AM
I note that Bluewolf027 mentions MN4. As the trajectory of this asteroid has now been recalculated and instead of missing us by around 40,000 kms I understand it will actually pass us at only 22,000 kms up, which is below geosynch, one wonders what would happen if it was to hit a space elevator? We may have some up by then. I guess we'd better be very careful where we put them so that trajectory doesn't bisect any of them.

Best wishes, Andy.

Den
2005-Feb-16, 03:26 PM
I have read that our moon is increasing it's distance from earth by something like six centimeters each year (correct me if I'm wrong).

Could this be due to the increase in mass that occured during the period that the moon was bombarded by the objects which caused it's crators? Or could the impacts have speeded its motion?

Some people suggest that the moon was birthed from the earth due to an impact.
If that is correct then how many other moons have been split from their respective planets. (I've never liked the idea much myself).

Are there any planed missions to monitor this asteroid in 2029?

Guest
2005-Feb-16, 05:38 PM
Why is the asteroid belt so far away, in relation to the rocky planets? why for instance do we not have an asteroid belt between Earth and Venus?
and is the asteroid belt made up of disintegrated planets or planets that never managed to form?
Thankyou for enriching universe today!

Guest
2005-Feb-16, 05:42 PM
Do you have any thoughts on the Clube/Napier/Bailey/Steel et al view that the break-up of a large comet in the inner solar system constitutes the main threat to life on Earth?

Given the evidence, do you think that the US NEO community should regard comets with a little more gravity?

Cheers,

Jay

hoarem
2005-Feb-16, 05:48 PM
Is there any way that we might be able to predict an earth hitting asteroid other than seeing it coming our way? ie: tracking them in the asteroid belt.
Thanks

JimAA2QA
2005-Feb-16, 07:00 PM
Hello, all

The real question, in my mind, is with so many nuclear powers and so many religious groups pushing against other religious groups, will our grandchildren even be around to worry about an astroid?

Or, will overpopulation do us in?

Better fill up the SUV, gang.

It is so sad to see serious work being persued by educated folks whilst most of sit and fiddle as Rome burns. Hmmm ... better cut budgets to eduction. Oh ... I forgot, that's been done - along with aid to old folks, children ....

My apologies to all for the vent, but I do wish work like has been done with the tracking and predicion for the astroid was more respected.



Best regards from Rochester, NY
Jim

Lorenda
2005-Feb-16, 08:00 PM
Originally posted by fraser@Feb 15 2005, 05:57 PM
SUMMARY: With all the recent news about asteroids and comets, I figure you've got a lot of questions. Well, now's your chance to get some answers. We've lined up astronomer Dr. David J. Tholen, a professor at the University of Hawaii, Institute for Astronomy who specializes in the search for Earth-crossing asteroids. Once again, visit the forum, post your questions for David, and we'll pick through and send him some zingers. I'll publish his answers in an upcoming issue of Universe Today.

Click here to visit the forum and post your question.

Thanks!

Fraser Cain
Publisher
Universe Today

What do you think about this story? Post your comments below.
[QUOTE] I have earlier read in an article that stated that astronomers have found a planet well I think they stated it was closre to earth than pluto is and that it is goig toward the direction of earth. It also stated that its physical characteristics or its compisition is the same as an astriods. I thought about this and did a bit of research about this. Appreantly astronomers hypothisiezed that later on in the future an astriod is going to hit earth. Well the planets name is called Sedan, its smaller than the moon and it was discoverd not far from hte astriod beit. Well right know I think it is the astriod that is goig to strike earth, but that answer is going to be clear soon with mre research
::unsure: <_<

Duane
2005-Feb-16, 09:07 PM
Originally posted by ebaber19@Feb 15 2005, 02:04 PM
Great topic&#33;&#33;
My question: What is the maximum size that body such as an asteroid can maintain its irregular shape, i.e. before gravity crushes it into a sphere. Thank you in advance
This is really just a math problem, albeit a complicated one. The short answer is about 600 KM, depending on its composition.

Duane
2005-Feb-16, 09:10 PM
Originally posted by Fred from Kalamazoo@Feb 15 2005, 12:54 PM
Are leading scientists finally giving up on the Oort Cloud theory or is this something we are still struggling to substantiate?
No, they are not "giving up" on the theory, especially considering they see many Oort clouds around other stars. It is not a struggle to substanciats the Oort cloud, it is a struggle to image one--they are, after all, small and a LONG way away from us.

Duane
2005-Feb-16, 09:22 PM
Originally posted by Bluewolf027@Feb 15 2005, 03:24 PM
If asteroid 2004 MN4 is really going to pass within 36000kms of earth...

Is it possible for the earth or the moons gravity to affect the orbit of the asteroid changing its path enough to hit either body (the earth or the moon)?
Yes, the Earth will bend the asteroids orbit. It is passing close enough that it might even pass its Roche Limit (http://scienceworld.wolfram.com/physics/RocheLimit.html) and break up.

If it does not break up, the chances that it will strike the Earth or Moon are slim, but not "non-zero". The Near Earth Asteroid (http://neo.jpl.nasa.gov/index.html) program at Nasa has calculated that the risk of it striking Earth is a 1 on the Torino Scale (http://impact.arc.nasa.gov/torino/) in 2035,2036 & 2037 with the biggest risk in 2036 (see here (http://neo.jpl.nasa.gov/risk/2004mn4.html))

Duane
2005-Feb-16, 09:36 PM
Originally posted by Den@Feb 16 2005, 08:26 AM
I have read that our moon is increasing it&#39;s distance from earth by something like six centimeters each year (correct me if I&#39;m wrong).

Could this be due to the increase in mass that occured during the period that the moon was bombarded by the objects which caused it&#39;s crators? Or could the impacts have speeded its motion?

Some people suggest that the moon was birthed from the earth due to an impact.
If that is correct then how many other moons have been split from their respective planets. (I&#39;ve never liked the idea much myself).

Are there any planed missions to monitor this asteroid in 2029?
Yes, it is slowly pulling away. This webpage (http://curious.astro.cornell.edu/question.php?number=124) explain why.
It is not because of any increase in its mass or any energy imparted by impacts.

The Impact Theory of Moon Formation (http://www.spacedaily.com/news/lunar-01d.html) is now generally accepted as the most probable origin of the moon. As far as we can see, there are no other moons which arose as a result of impact, although some have speculated that Pluto and Charon (http://www.space.com/scienceastronomy/pluto_formation_050127.html) may have formed this way as well.

Optimist Prime
2005-Feb-16, 09:37 PM
What are your plans for gigantic space supertankers bringing raw materials from NEA&#39;s to Earth orbit for use in building space colonies?.

Duane
2005-Feb-16, 09:38 PM
Hey jamesrhampton and Lorenda, were you planning to ask a question and just forgot?

Pro-astro
2005-Feb-17, 07:54 AM
Idea about asteroid detection satellites (cluster) :

I was wondering if anybody has come up with the idea to design and
launch a set of say 8+ satellites specialised on detection of asteriods,
that would be placed around L points or around the earth&#39;s orbit ?
Isn&#39;t this a suitable idea to increase detection of asteroids (esp.
PHA) , instead of relying on good weather to spot them on earth ?

Respectfully,
Victor.

FR079755
2005-Feb-19, 06:07 PM
HI

I have 2 questions about Ceres :

How it is that Ceres seems to have an atmosphere with so little gravity ?

How much energy is emitted from Ceres compared with the energy received from the SUN ?
because some rocky Planet like Venus , and giant planets like
Jupiter ans Saturn are emitting more than receiving .

Thank you for your attention

gnosys
2005-Feb-21, 09:45 AM
Are two (or more) asteroids ever found in orbit around each other, or will objects that small inevitably drift apart?

Is it rare for asteroids to collide with each other?

How large must an asteroid be before its gravity would be noticeable to a human standing on its surface? How large for a human being to be unable to escape its gravity merely by jumping?

What was the largest confirmed meteor impact in recent history? (On Earth)

In the Asteroid Belt, is there a lower limit on the size of asteroids -- beneath which they would tend to have been captured by the gravity of a larger asteroids?

Is there any distinct border to the asteroid belt, or does it thin out completely gradually into the relatively empty space surrounding it? Within the belt, are the asteroids anywhere near as densely packed as in typical illustrations, or could you go miles without seeing an asteroid of any size?

I&#39;ve been reading about the possibility of building a space elevator. What might be possible new strategies for protecting a structure in space (or indeed a satellite, space station or ship) from asteroids?

wstevenbrown
2005-Feb-22, 06:06 AM
Asteroid Miners:

There was a lot of valuable discussion in OlaD&#39;s string called "Commercialising Space." Additionally:


Here is a resource which may prove useful. Its working title is "So You Want to Mine an Asteroid?":


http://fti.neep.wisc.edu/neep533/SPRING199.../lecture19.html


Yr srvnt--S :rolleyes:

astronary
2005-Mar-29, 09:57 PM
I live in Morocco and a friend saw all the rock salesmen and wondered if they had any meteorites for sale. I said not to ask for one or else they might start mass-producing them like their handmade geodes&#33; But really, if they did start marketing meteorites how could you tell a real one from a fake one?&#33; : ) Where is the best place to look for them, if there is such a place? Thanx, and I hope my Moroccan rock sellers aren&#39;t reading this column&#33;