[QUOTE][i]Originally posted by E.T [/i]
[B]It will happen, it's just matter of time.
[url]http://spaceweather.com/[/url]
[i]On 3 Feb 2004 there were 569 known Potentially Hazardous Asteroids[/i]
[/B][/QUOTE]
Scarey stuff!!:eek: Its quite amazing that it hasn't already happened!
[QUOTE][B]"Whether it happens in a hundred years or a thousand years or a million years, eventually our Sun will grow cold and go out. When that happens, it won't just take us. It'll take Marilyn Monroe and Lao-Tzu and Einstein and Morobuto and Buddy Holly and Aristophenes .. and all of this .. all of this was for nothing unless we go to the stars."[/B][/QUOTE]
I love that quote, so true! And it won't matter where we are in our solar system. That is why I think as much as I would love Humans to go to Mars I'd rather the money invested into time travel, least then we can get to other planets outside of this system. And we would have the memories of people before us, so they wouldn't be entirely gone. :)
Isn't the sun half way through its life now?
[QUOTE][B]A big enough rock and its not gonna matter how far underground you are, EVERYTHING is screwed rember the moon is ejected material from just such an event .[/B][/QUOTE]
I didn't think any scientist knew for definite with regards to how the Moon got here. I wonder why if this is true, why its relatively round having been ejected from the earth. Why not shaped like an asteriod?
[QUOTE][i]Originally posted by MartianDust [/i]
[B]I didn't think any scientist knew for definite with regards to how the Moon got here. I wonder why if this is true, why its relatively round having been ejected from the earth. Why not shaped like an asteriod? [/B][/QUOTE]
Too much mass. At some point the gravity attraction of a mass tends to form a spherical shape. You can see it in even smaller bodies in the asteroid belt. Given enough time, things will settle into a sphere at a certain threshold of mass.
;)
Regarding Asteroid Defense, I think smacking it with another body (like billiard balls) might be reasonable as long as trajectory is right and delivery runs smooth.
Exactly; over time, every substance is liquid. Mountains flatten and smooth over, canyon walls crumble and fill in the empty areas. If it weren't for tectonic activity and factors other than gravity, the planet would eventually become even smoother than it already is (proportionally speaking, it's already far smoother than a billiard ball).
AnlaShok: I fail to see why any of that is a bad thing.
[QUOTE][i]Originally posted by Tyvar [/i]
[B]A big enough rock and its not gonna matter how far underground you are, EVERYTHING is screwed ;) rember the moon is ejected material from just such an event ;) [/B][/QUOTE]
This is nice tool:
[url]http://www.lpl.arizona.edu/tekton/crater_c.html[/url]
Using 100km asteroid as projectile, let's assume it's dense rock. (many meteorites are almost solid iron and propably many asteroids have very dense cores)
Speed 17km/s (earth&moon asteroid impacts)
Impact angle: 60
And for target: normal earth gravity, density 3000, and rock.
Nice hole, isn't it? :D
Biggest asteroids could easily shatter whole earth if they would collide with earth..
And this, well read yourself.
[url]http://solarsystem.nasa.gov/planets/profile.cfm?Object=Miranda[/url]:
[url]http://photojournal.jpl.nasa.gov/jpeg/PIA00140.jpg[/url]
[url]http://photojournal.jpl.nasa.gov/feature/miranda[/url]
It's good that bigger asteroids lie in stable orbits in asteroid belt.
[QUOTE][i]Originally posted by JackN [/i]
[B]Regarding Asteroid Defense, I think smacking it with another body (like billiard balls) might be reasonable as long as trajectory is right and delivery runs smooth.
:D [/B][/QUOTE]
Thus astronauts training program need to include billiard lessons from now on. :p
[QUOTE][i]Originally posted by JackN [/i]
[B]Regarding Asteroid Defense, I think smacking it with another body (like billiard balls) might be reasonable as long as trajectory is right and delivery runs smooth.[/B][/QUOTE]
That would require that object in collision course should be strong enough, too hard hit could otherwise break it which could cause little "meteorite shower".
Half dozen half km asteroids could produce destruction on much wider area than one asteroid with 1 km size.
[QUOTE][i]Originally posted by MartianDust [/i]
[B]I love that quote, so true! And it won't matter where we are in our solar system. That is why I think as much as I would love Humans to go to Mars I'd rather the money invested into time travel, least then we can get to other planets outside of this system. And we would have the memories of people before us, so they wouldn't be entirely gone. :)
Isn't the sun half way through its life now?[/B][/QUOTE]
Well, Mars would be the first step in colonizing other systems, and someday, galaxies. I mean, it's probably best to improve our techniques before we start sending people and money on extrasolar activities... kind of like how it takes a few rover launchers before you get one that doesn't crash. :)
[QUOTE][i]Originally posted by the_exile [/i]
[B]Well, Mars would be the first step in colonizing other systems, and someday, galaxies. I mean, it's probably best to improve our techniques before we start sending people and money on extrasolar activities... kind of like how it takes a few rover launchers before you get one that doesn't crash. :) [/B][/QUOTE]
I understand what you're say, just if we did know time travel it wouldn't take long to get anywhere else, maybe faster than Mars. Its difficult to know when time will run out on us don't want to get all doom and gloom but it could be tomorrow for all we know. Specially after reading it was over 550 asteriods seen in one day! I guess they're all from the asteriod belt and not from another system outside ours? I just wish time travel and travelling to Mars could both be done rather soonish! :)
And I don't really know why we have to have a moonbase before going to Mars. It only takes 3 days to get to the moon doesn't it?
If it was half way to Mars I could understand the refueling part!
[B][QUOTE]That would require that object in collision course should be strong enough, too hard hit could otherwise break it which could cause little "meteorite shower".
Half dozen half km asteroids could produce destruction on much wider area than one asteroid with 1 km size.[/B][/QUOTE]
Are you sure about that? Maybe it would depend on what velocity they were travelling or if the blast could infact slow the pace down. :)
[QUOTE][B]Nah, we just need to get Lister up there..[/B][/QUOTE]
Oh Red Dwarf! That was a scream! :)
Biggles<font color=#AAFFAA>The Man Without a Face</font>
You're going to have to clarify this term "time travel" that you're throwing around. :) I fail to see how travelling through time would help us get to other planets/stars faster. You'd still live for the same length of time, and time travel does not imply travel through the 3 known spatial dimensions. Merely moving through time wouldn't help us unless we went into the future and the people who didn't managed to develop a nice fast drive before we reappear that we can use. Even that would only solve the problem for those who travel to the future; if the Earth got obliterated the day after those people left they would not only arrive with no nice fast drive waiting for them, but likely no planet/civilisatio either.
[QUOTE][i]Originally posted by MartianDust [/i]
[B]And I don't really know why we have to have a moonbase before going to Mars. It only takes 3 days to get to the moon doesn't it?[/B][/QUOTE]
Well, there's something to be said for practice.
[QUOTE][B]Oh Red Dwarf! That was a scream! :) [/B][/QUOTE]
we could learn alot of lessons about hostile environments and colonisation of isolated places by colonising the [I]ocean[/I] .
There is effectively a humungus wet desert out there.
There isnt a whole massive lot of difference between a pressure vessel to keep things in or out...
and help is perhaps only a 1000 miles away... not a billion +....
Biggles<font color=#AAFFAA>The Man Without a Face</font>
I agree there, colonising the ocean would provide some interesting experience. But we'd have to be [b]heaps[/b] more careful than in space because there is a shitload of life in the ocean. There ain't a whole lot on the moon.
That would require constructions made of very thick steel. Pressure increases one bar for every ten meters of water and world ocean's average depth is few kms.
Continental shelfs are almost only areas which depth isn't counted on km.
While I do agree that colonizing the oceans would be neat (floating colonies, though, perhaps anchored to the ground, or maybe even free-roaming), I don't think it would be as useful as practice for space-based operations.
[QUOTE][i]Originally posted by Biggles [/i]
[B]You're going to have to clarify this term "time travel" that you're throwing around. :)[/B][/QUOTE]
No I've made abit of a silly cock up here and termed it wrong. What I meant was travelling at the speed of light or faster and using wormholes to get from A - Z. Like the demonstrations of the folding of space with the paper folding theory. Sorry! Don't know why I termed it time travel! :o
Colonization of the sea is a good idea. Though I'd rather be afloat like in Waterworld. This may happen anyway if global warming carries on.
I expect you know that apart from asteriods etc.. scientists predict there may be an ice age within the next 10 - 20 yrs cos of the conveyor belt under the sea which brings the warm water from the south which is currently being diluted by cold from the melting ice caps. I don't know the proper terms for this but
this would not be a major crisis as above.
Comments
[B]and
[URL=http://www.washingtonpost.com/wp-dyn/articles/A21186-2004Jan15.html]http://www.washingtonpost.com/wp-dyn/articles/A21186-2004Jan15.html[/URL]
Guess we know why the sudden interest now, hmm? [/B][/QUOTE]
In all fairness, you're comparing this to the original space program, which was, in essence, the worlds most expensive dick-measuring contest.
:D :eek: :D
[B]It will happen, it's just matter of time.
[url]http://spaceweather.com/[/url]
[i]On 3 Feb 2004 there were 569 known Potentially Hazardous Asteroids[/i]
[/B][/QUOTE]
Scarey stuff!!:eek: Its quite amazing that it hasn't already happened!
[QUOTE][B]"Whether it happens in a hundred years or a thousand years or a million years, eventually our Sun will grow cold and go out. When that happens, it won't just take us. It'll take Marilyn Monroe and Lao-Tzu and Einstein and Morobuto and Buddy Holly and Aristophenes .. and all of this .. all of this was for nothing unless we go to the stars."[/B][/QUOTE]
I love that quote, so true! And it won't matter where we are in our solar system. That is why I think as much as I would love Humans to go to Mars I'd rather the money invested into time travel, least then we can get to other planets outside of this system. And we would have the memories of people before us, so they wouldn't be entirely gone. :)
Isn't the sun half way through its life now?
[QUOTE][B]A big enough rock and its not gonna matter how far underground you are, EVERYTHING is screwed rember the moon is ejected material from just such an event .[/B][/QUOTE]
I didn't think any scientist knew for definite with regards to how the Moon got here. I wonder why if this is true, why its relatively round having been ejected from the earth. Why not shaped like an asteriod?
:) :alien:
[B]I didn't think any scientist knew for definite with regards to how the Moon got here. I wonder why if this is true, why its relatively round having been ejected from the earth. Why not shaped like an asteriod? [/B][/QUOTE]
Too much mass. At some point the gravity attraction of a mass tends to form a spherical shape. You can see it in even smaller bodies in the asteroid belt. Given enough time, things will settle into a sphere at a certain threshold of mass.
;)
Regarding Asteroid Defense, I think smacking it with another body (like billiard balls) might be reasonable as long as trajectory is right and delivery runs smooth.
:D
AnlaShok: I fail to see why any of that is a bad thing.
[B]A big enough rock and its not gonna matter how far underground you are, EVERYTHING is screwed ;) rember the moon is ejected material from just such an event ;) [/B][/QUOTE]
This is nice tool:
[url]http://www.lpl.arizona.edu/tekton/crater_c.html[/url]
Using 100km asteroid as projectile, let's assume it's dense rock. (many meteorites are almost solid iron and propably many asteroids have very dense cores)
Speed 17km/s (earth&moon asteroid impacts)
Impact angle: 60
And for target: normal earth gravity, density 3000, and rock.
Nice hole, isn't it? :D
Biggest asteroids could easily shatter whole earth if they would collide with earth..
[url]http://solarsystem.nasa.gov/planets/profile.cfm?Object=Mar_Phobos[/url]
[url]http://photojournal.jpl.nasa.gov/catalog/PIA02266[/url]
And this, well read yourself.
[url]http://solarsystem.nasa.gov/planets/profile.cfm?Object=Miranda[/url]:
[url]http://photojournal.jpl.nasa.gov/jpeg/PIA00140.jpg[/url]
[url]http://photojournal.jpl.nasa.gov/feature/miranda[/url]
It's good that bigger asteroids lie in stable orbits in asteroid belt.
[B]Regarding Asteroid Defense, I think smacking it with another body (like billiard balls) might be reasonable as long as trajectory is right and delivery runs smooth.
:D [/B][/QUOTE]
Thus astronauts training program need to include billiard lessons from now on. :p
- PJH
[B]Regarding Asteroid Defense, I think smacking it with another body (like billiard balls) might be reasonable as long as trajectory is right and delivery runs smooth.[/B][/QUOTE]
That would require that object in collision course should be strong enough, too hard hit could otherwise break it which could cause little "meteorite shower".
Half dozen half km asteroids could produce destruction on much wider area than one asteroid with 1 km size.
[B]I love that quote, so true! And it won't matter where we are in our solar system. That is why I think as much as I would love Humans to go to Mars I'd rather the money invested into time travel, least then we can get to other planets outside of this system. And we would have the memories of people before us, so they wouldn't be entirely gone. :)
Isn't the sun half way through its life now?[/B][/QUOTE]
Well, Mars would be the first step in colonizing other systems, and someday, galaxies. I mean, it's probably best to improve our techniques before we start sending people and money on extrasolar activities... kind of like how it takes a few rover launchers before you get one that doesn't crash. :)
[B]Well, Mars would be the first step in colonizing other systems, and someday, galaxies. I mean, it's probably best to improve our techniques before we start sending people and money on extrasolar activities... kind of like how it takes a few rover launchers before you get one that doesn't crash. :) [/B][/QUOTE]
I understand what you're say, just if we did know time travel it wouldn't take long to get anywhere else, maybe faster than Mars. Its difficult to know when time will run out on us don't want to get all doom and gloom but it could be tomorrow for all we know. Specially after reading it was over 550 asteriods seen in one day! I guess they're all from the asteriod belt and not from another system outside ours? I just wish time travel and travelling to Mars could both be done rather soonish! :)
And I don't really know why we have to have a moonbase before going to Mars. It only takes 3 days to get to the moon doesn't it?
If it was half way to Mars I could understand the refueling part!
[B][QUOTE]That would require that object in collision course should be strong enough, too hard hit could otherwise break it which could cause little "meteorite shower".
Half dozen half km asteroids could produce destruction on much wider area than one asteroid with 1 km size.[/B][/QUOTE]
Are you sure about that? Maybe it would depend on what velocity they were travelling or if the blast could infact slow the pace down. :)
[QUOTE][B]Nah, we just need to get Lister up there..[/B][/QUOTE]
Oh Red Dwarf! That was a scream! :)
[B]And I don't really know why we have to have a moonbase before going to Mars. It only takes 3 days to get to the moon doesn't it?[/B][/QUOTE]
Well, there's something to be said for practice.
[QUOTE][B]Oh Red Dwarf! That was a scream! :) [/B][/QUOTE]
Agreed!
[url]http://www.space.com/news/europe_moon_040203.html[/url]
There is effectively a humungus wet desert out there.
There isnt a whole massive lot of difference between a pressure vessel to keep things in or out...
and help is perhaps only a 1000 miles away... not a billion +....
That would require constructions made of very thick steel. Pressure increases one bar for every ten meters of water and world ocean's average depth is few kms.
Continental shelfs are almost only areas which depth isn't counted on km.
[B]...and help is perhaps only a 1000 miles away... not a billion +.... [/B][/QUOTE]
Sometimes there isn't a whole heap of difference in the outcome here...
:p
[B]You're going to have to clarify this term "time travel" that you're throwing around. :)[/B][/QUOTE]
No I've made abit of a silly cock up here and termed it wrong. What I meant was travelling at the speed of light or faster and using wormholes to get from A - Z. Like the demonstrations of the folding of space with the paper folding theory. Sorry! Don't know why I termed it time travel! :o
Colonization of the sea is a good idea. Though I'd rather be afloat like in Waterworld. This may happen anyway if global warming carries on.
I expect you know that apart from asteriods etc.. scientists predict there may be an ice age within the next 10 - 20 yrs cos of the conveyor belt under the sea which brings the warm water from the south which is currently being diluted by cold from the melting ice caps. I don't know the proper terms for this but
this would not be a major crisis as above.
:)