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(Mirror.co.uk)   No need to panic for this asteroid, it's only going to miss the earth by a measly 15,000 miles on February 15   (mirror.co.uk) divider line 135
    More: Scary, disasters, University of New South Wales, space rocks  
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9511 clicks; posted to Main » on 07 Feb 2013 at 3:58 PM (1 year ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



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2013-02-07 04:24:58 PM

namatad: WhoGAS: two would affect us in quite negative ways.

except that the likely hood of 1b happening is ~= zero
the chance of 2012 DA14 causing 1b is zero. (2012 DA14 is so tiny and moving so slow that it would have to hit a city directly to have an impact)
the chance of 2 happening and having an impact is tiny. the chance of  2012 DA14 hitting the moon and having any impact at all on the earth is zero.

/for all values of zero other than the pendant version of NOT ZERO JUST so close to zero to be functionally equiv, but you cant call it zero)
/but go ahead and argue that you mean affect as in if it is possible, no matter how vanishingly small
/strangely enough the dino-civilizations thought the same thing right beforechicxulub hit the earth.


So... you're saying there's a chance?
 
2013-02-07 04:26:03 PM

namatad: SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.

ROFL


[la snippa]

tl;dr
nothing would happen to us


But what if Omnipotus takes a bite out of the moon.


home.jps.net


/ M-O-O-N, that spells lunch.
 
2013-02-07 04:27:44 PM
It's effectively a wandering nuke. It can't end the world, but if everything lines up, it could sure ruin a city.

Depending on which city gets it, the world may be improved.

/don't blame me - it would be chalked up as an "act of God."
 
2013-02-07 04:28:58 PM

Diogenes: If we all die, it will because of all you fornicators having the sex on Valentine's Day.


Don't blame me, I've been married 23 years.
 
2013-02-07 04:29:26 PM
i877.photobucket.com
 
2013-02-07 04:29:41 PM
Wait until it hears my earth-shattering battle cry.
 
2013-02-07 04:30:00 PM
Everyone chill the fark out.  I got this

t3.gstatic.com
 
2013-02-07 04:30:33 PM
I'll just leave this here lol!
 
2013-02-07 04:30:44 PM
img688.imageshack.us
 
2013-02-07 04:30:52 PM

Diogenes: SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.

Oh definitely.  But the potential for barbarians and sorcery looks pretty good.

[3.bp.blogspot.com image 425x744]


Someone needs to make a live action Thundarr the Barbarian movie.
 
2013-02-07 04:31:45 PM
Oops, goddam unfetchable$#@!

cdnimg.visualizeus.com
 
2013-02-07 04:31:46 PM

AlwaysRightBoy: Diogenes: If we all die, it will because of all you fornicators having the sex on Valentine's Day.

Don't blame me, I've been married 23 years.


Married 23 years and your handle is "always right boy"? Somethings not adding up here.
 
2013-02-07 04:32:45 PM

namatad: Skywolf the Scribbler: 3) The moon gets knocked out of orbit by a large asteroid, towards the Earth, causing tidal catastrophe until its orbit decays and we are all farked

lawl
the energy required to knock the moon out of its orbit is literally astronomical.
1) the body would have to be moon-sized, which we know most/all of the moon sized objects in most of the solar system (within the orbit of say neptune). (dont get me started outside the orbit of pluto)
Think pool balls bouncing off of each other.
so never gonna happen

2) small body. the body would have to have enough momentum (mass times velocity) to be a significant fraction of the moons orbital momentum. Think trying to move your house with a grain of sand.
If the body is small enough, it would have to be moving so fast that it would shatter on impact and fracture the moon rather than "move" the moon.

and yet, people were worried that the world would end in 2012 .... LOL


That's based on the assumption that the object was the same density as the moon. If it were say a rogue brown dwarf, or burnt out black/white dwarf or a singularity it could be smaller than the earth or moon and yet have nearly the mass of our sun, or much much more. If that happened, we may not even know it was there until it started playing toss with the planets in the solar system.
 
2013-02-07 04:32:58 PM

namatad: SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.

ROFL
the fact that you even ASK this question is a sign that the understanding of science in the world ... well most people are dumb.

if it were on the dark side of the moon, there would be the ringing of many alarms

tl;dr
nothing would happen to us


dark side?

you mean the 'far side' that always faces away from earth but is alternately light and dark as it orbits the earth

upload.wikimedia.org
 
2013-02-07 04:33:22 PM
I should probably read threads before I post.  Wouldn't you agree, BunkoSquad?
 
2013-02-07 04:34:59 PM

NotARocketScientist: 3) The moon gets knocked out of orbit by a large asteroid, towards the Earth, causing tidal catastrophe until its orbit decays and we are all farked

Planetary bodies are not pool balls, they can not be knocked any which way. To cause the moon to have an orbit that decays and falls into earth you actually have to decrease its energy and speed it up. (Larger orbits require more energy but the body actually moves slower).  This means that the large asteroid would need to not only bounce off the moon, but take considerably more energy with it than it came in with. This is not likely.


You could also have deterioration of the moon's orbit caused by a black hole passing through the solar system's plane at near-right angles
 
2013-02-07 04:35:36 PM

Hobodeluxe: Diogenes: SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.

Oh definitely.  But the potential for barbarians and sorcery looks pretty good.

[3.bp.blogspot.com image 425x744]

Someone needs to make a live action Thundarr the Barbarian movie.


I think that would be cool.  But as with all those things, it risks ruining another cherished memory.

/debbie downer
 
2013-02-07 04:37:45 PM

namatad: SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.

ROFL
the fact that you even ASK this question is a sign that the understanding of science in the world ... well most people are dumb.

1) "take out the moon" - let's break that down
a) take out = moon magically disappeared, no fragments. poof tides caused by the moon would go away. there would possibly be some residual oscillation, but that would quickly dampen. Quakes caused by this would probably not be an issue. life requiring the tides to survive would suffer. life requiring moonlight for breeding and what no would suffer.
but this would be the best case

b) take out = blow to pieces. well ... this would take a HUGE asteroid moving at a large delta-V. which we would already have seen and know was coming decades in advance. but going with the case
the pieces would SHATTER. some would go up and out, some would come down, some would form an AWESOME asteroid belt/ring around the earth for a rather long time. Satellites would become a thing of the past, along with the space station.

BUT, the pieces which rained down? well we would be farked. even a small percent hitting the earth would royally fark us.

2) the same tiny asteroid missing us but hitting the moon.
MEH
a) there would be moonquakes, which would have no impact on us
b) there would be ejecta, some of which would rain down on the earth, but we are talking much smaller pieces, smaller than the impacting asteroid, and in the end, meh
c) this would only be a problem for us if the impact was on the near side of the moon. if it were on the dark side of the moon, there would be the ringing of many alarms

tl;dr
nothing would happen to us


I suppose that plenty of people here could ask scientific questions that you do not know the answer to, so by your very own reasoning you would be considered dumb, right?
 
2013-02-07 04:38:21 PM

VvonderJesus: [imgs.xkcd.com image 462x316]


I have never understood making fun of someone because they don't know something.  Especially if they are asking so they can learn.

Making fun of the deliberately uninformed, that's different.
 
2013-02-07 04:39:47 PM

SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.


People shouldn't have been so mean.
All of them have heard their teachers udder the words "there is no such thing as a dumb question". But this is Fark, so it is not a place to ask questions and not expect to get rude and demeaning remarks by people that are obviously geniuses that have nothing better to do than hang out in Fark looking to show off their big brains.

As simple search would have found *this* and other answers to your guestion.
 
2013-02-07 04:40:22 PM

aseras: That's based on the assumption that the object was the same density as the moon. If it were say a rogue brown dwarf, or burnt out black/white dwarf or a singularity it could be smaller than the earth or moon and yet have nearly the mass of our sun, or much much more. If that happened, we may not even know it was there until it started playing toss with the planets in the solar system.


true
but we know that there are no unknown, super-massive, objects within .... the solar system. the perturbations of orbits would be large enough for us to have detected already.

which leaves extra-solar objects ....
Time to rewatch When Worlds Collide
 
2013-02-07 04:41:17 PM

Cthulhu_is_my_homeboy: SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.

Serious, not sure if.



SlothB77: i'm not that bright. see my posts in the politics tab.

 
2013-02-07 04:41:18 PM

Mugato: Why are people so obsessed with the end the world? It's too bad that your life sucks so much that you're praying for the end of the world but it's not going to happen. Not until the sun burns out and that's a period of time that neither you nor I can comprehend. So farking relax about the end of the world and if you're looking forward to it so much, just kill yourself and get it over with.


Lookit....I just need to know if now is the time I take a dump on the boss' desk and tear through my remaining life savings on escorts and top-shelf bourbon.
 
2013-02-07 04:41:36 PM

SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.


The tides are the least of the problem.  If the moon broke apart it would likely rain down on the planet.  That wouldn't be any fun.  Even if it didn't the moon does far more than affect the tide.  It also keeps the planet spinning at the right rate, and keeps the plates from fusing together.

But that isn't what I came here to say.  This is what I came to say...

There is so much ignorance in that article it's laughable.  I'll just point out two things:
1.  We can't deflect an asteroid with a rocket of any kind.  We don't have guidance or meneuvering systems to navigate out to something like that.  Weapon's like that are not designed for space flight.
2.  We can't nuke the thing and blow it apart because even if that were possible, the peices would still rain down on earth, and they would then be radioactive.  Out of the frying pan, into the fire.
 
2013-02-07 04:41:56 PM

INeedAName: namatad: WhoGAS: two would affect us in quite negative ways.

except that the likely hood of 1b happening is ~= zero
the chance of 2012 DA14 causing 1b is zero. (2012 DA14 is so tiny and moving so slow that it would have to hit a city directly to have an impact)
the chance of 2 happening and having an impact is tiny. the chance of  2012 DA14 hitting the moon and having any impact at all on the earth is zero.

/for all values of zero other than the pendant version of NOT ZERO JUST so close to zero to be functionally equiv, but you cant call it zero)
/but go ahead and argue that you mean affect as in if it is possible, no matter how vanishingly small
/strangely enough the dino-civilizations thought the same thing right beforechicxulub hit the earth.

So... you're saying there's a chance?


On the politics tab, this would pass for a plausible explanation to 90%.
 
2013-02-07 04:42:47 PM

hp6sa: VvonderJesus: [imgs.xkcd.com image 462x316]

I have never understood making fun of someone because they don't know something.  Especially if they are asking so they can learn.

Making fun of the deliberately uninformed, that's different.


thetfs.ca
 
2013-02-07 04:44:39 PM
Don't freak out or anything, but I do volunteer work tutoring kids after school.  For example, last night I tutored a 7th grader in Earth Science.  The kid speaks English as a second language, but is getting the best grades he has ever gotten.  This is my first year tutoring him.

I swear to god I am not making this up.  (I re-learned what mitosis is.)
 
2013-02-07 04:46:36 PM

Mock26: I suppose that plenty of people here could ask scientific questions that you do not know the answer to, so by your very own reasoning you would be considered dumb, right?


yes

but, most people have played pool, or run into a wall, or been in a car accident, or pushed someone, or tried to block a rushing linesman. basic analogy can be used to guesstimate that moving the moon would require either a REALLY large object, really massive object, really fast object or some combination.

on the other hand, texas is banning the teaching of critical thinking in schools ...


Horsebolt McStabledoor: dark side?
you mean the 'far side' that always faces away from earth but is alternately light and dark as it orbits the earth


It was only added to make bad dark side of the moon reference. Now I have to listen to the album. YAY
 
2013-02-07 04:50:53 PM

Diogenes: SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.

Oh definitely.  But the potential for barbarians and sorcery looks pretty good.

[3.bp.blogspot.com image 425x744]


*damn you so much*
 
2013-02-07 04:55:20 PM
If everyone is done pointing out how stupid everyone is can I ask a question?

Anyone know if there will be anything viewable for this fly by?
 
2013-02-07 04:57:48 PM

crotchgrabber: If everyone is done pointing out how stupid everyone is can I ask a question?

Anyone know if there will be anything viewable for this fly by?


http://en.wikipedia.org/wiki/2012_DA14
 
2013-02-07 04:59:25 PM

Mugato: Why are people so obsessed with the end the world? It's too bad that your life sucks so much that you're praying for the end of the world but it's not going to happen. Not until the sun burns out and that's a period of time that neither you nor I can comprehend. So farking relax about the end of the world and if you're looking forward to it so much, just kill yourself and get it over with.


Well, the Earth will be around for another 5.5 billion years or so. However, humanity will be dead long before then. For instance, in about 1 billion years when the oceans boil away due to the sun getting warmer. Or in 600 million years when c3 photosynthesis will no longer be possible due to the sun's increasing luminosity. That is, assuming a Gamma Ray Burst or asteroid impact doesn't do us in by then.
 
2013-02-07 05:00:32 PM

MyToeHurts: As simple search would have found *this* and other answers to your guestion.


Interesting article, thanks. I would love to read something that details all the math involved, anyone have any good links?
 
2013-02-07 05:01:33 PM

OtherLittleGuy: texdent: Just get Bruce Willis. He'll save us.

He's busy in Moscow.


What about Ben Affleck? Is he busy?
 
2013-02-07 05:18:47 PM

namatad: It is estimated that there are more than a million near-Earth asteroids smaller than 100 meters
If it were to hit Earth in the distant future, it is estimated that it would produce the equivalent of 2.5 of TNT. The has been estimated at 3−20 megatons. Asteroids about 50 meters in diameter are expected to impact Earth once every 1200 years or so.

so pretty much nothing. esp since this thing is tiny and would almost certainly hit the ocean. well about 66% chance of miss.


it's estimated that you're a douche
 
2013-02-07 05:19:44 PM

SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.


Yes.

sarahsaysreadbooks.files.wordpress.com
 
2013-02-07 05:19:47 PM

BigLuca: NotARocketScientist: 3) The moon gets knocked out of orbit by a large asteroid, towards the Earth, causing tidal catastrophe until its orbit decays and we are all farked

Planetary bodies are not pool balls, they can not be knocked any which way. To cause the moon to have an orbit that decays and falls into earth you actually have to decrease its energy and speed it up. (Larger orbits require more energy but the body actually moves slower).  This means that the large asteroid would need to not only bounce off the moon, but take considerably more energy with it than it came in with. This is not likely.


You could also have deterioration of the moon's orbit caused by a black hole passing through the solar system's plane at near-right angles


Ow, my back.
 
2013-02-07 05:23:37 PM

hp6sa: VvonderJesus: [imgs.xkcd.com image 462x316]

I have never understood making fun of someone because they don't know something.  Especially if they are asking so they can learn.

Making fun of the deliberately uninformed, that's different.


Sure, but it takes a big man to admit he took a few college courses that were easy A's just so he could claim everyone else is stupid and mock naive questions.
 
2013-02-07 05:33:45 PM

namatad: ROFL
the fact that you even ASK this question is a sign that the understanding of science in the world ... well most people are dumb.....

b) take out = blow to pieces. well ... this would take a HUGE asteroid moving at a large delta-V. which we would already have seen and know was coming decades in advance.


Just because you had to write a smartass response to someone asking a simple question I'll point at that delta V is acceleration.  What you meant to say was velocity, v.  Acceleration has nothing to do with momentum, momentum is a function of mass and velocity.  You could have an object with a very high acceleration and a comparatively low momentum, or a momentum that is instantaneously zero even.
 
2013-02-07 05:37:54 PM

crotchgrabber: If everyone is done pointing out how stupid everyone is can I ask a question?

Anyone know if there will be anything viewable for this fly by?


That was a stupid pretty damn good question.

Unfortunately we won't be able to view it.
 
2013-02-07 05:47:29 PM

Diogenes: Somacandra: Diogenes: Oh definitely. But the potential for barbarians and sorcery looks pretty good.

From the depths of hell I shake my tiny fist at thee.

A day late and a Mok short ;-)


"a Mok! a Mok! a Mok!"

media.tumblr.com
 
2013-02-07 05:58:51 PM

Cognizer: Diogenes: Somacandra: Diogenes: Oh definitely. But the potential for barbarians and sorcery looks pretty good.

From the depths of hell I shake my tiny fist at thee.

A day late and a Mok short ;-)

"a Mok! a Mok! a Mok!"

[media.tumblr.com image 300x194]


ol' horsie was kinda cute back in the day
 
2013-02-07 06:02:35 PM

namatad: SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.

ROFL
the fact that you even ASK this question is a sign that the understanding of science in the world ... well most people are dumb.

1) "take out the moon" - let's break that down
a) take out = moon magically disappeared, no fragments. poof tides caused by the moon would go away. there would possibly be some residual oscillation, but that would quickly dampen. Quakes caused by this would probably not be an issue. life requiring the tides to survive would suffer. life requiring moonlight for breeding and what no would suffer.
but this would be the best case

b) take out = blow to pieces. well ... this would take a HUGE asteroid moving at a large delta-V. which we would already have seen and know was coming decades in advance. but going with the case
the pieces would SHATTER. some would go up and out, some would come down, some would form an AWESOME asteroid belt/ring around the earth for a rather long time. Satellites would become a thing of the past, along with the space station.

BUT, the pieces which rained down? well we would be farked. even a small percent hitting the earth would royally fark us.

2) the same tiny asteroid missing us but hitting the moon.
MEH
a) there would be moonquakes, which would have no impact on us
b) there would be ejecta, some of which would rain down on the earth, but we are talking much smaller pieces, smaller than the impacting asteroid, and in the end, meh
c) this would only be a problem for us if the impact was on the near side of the moon. if it were on the dark side of the moon, there would be the ringing of many alarms

tl;dr
nothing would happen to us


Yeah, but that's a persona that you put on.
 
2013-02-07 06:02:40 PM

namatad: c) this would only be a problem for us if the impact was on the near side of the moon. if it were on the dark side of the moon, there would be the ringing of many alarms


If an asteroid hit the far side of the moon, it might be a good opportunity to collect some lunar meteorites that we can be almost certain came from the far side of the moon.  None of the Apollo missions landed there, and so far as I know neither did the Russian sample-return mission.
 
2013-02-07 06:03:36 PM

SlothB77: Cthulhu_is_my_homeboy: SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.

Serious, not sure if.


SlothB77: i'm not that bright. see my posts in the politics tab.


Basically, the Moon is huuuuuuge compared to any asteroid that could come near Earth. When people talk about an asteroid hitting the earth and wiping us out, they're not talking about the planet being destroyed. The planet itself would barely even notice, it's just the thin film of trees and people and so on covering the surface that would be obliterated. The kind of asteroid involved is between "apartment building" and "small town" in terms of size. If that hit the moon you'd need a really good telescope to see the impact.
 
2013-02-07 06:04:51 PM

NotARocketScientist: 3) The moon gets knocked out of orbit by a large asteroid, towards the Earth, causing tidal catastrophe until its orbit decays and we are all farked

Planetary bodies are not pool balls, they can not be knocked any which way. To cause the moon to have an orbit that decays and falls into earth you actually have to decrease its energy and speed it up. (Larger orbits require more energy but the body actually moves slower)


Yes, the kinetic energy of the moon would have to decrease, but no, the moon would not have to be sped up. The moon would speed up naturally as it falls toward the earth, and then after it looped around the earth, it would start slowing down again.

This means that the large asteroid would need to not only bounce off the moon, but take considerably more energy with it than it came in with.

the slingshot effect allows bodies to transfer energy between them without having to actually hit each other. However, you can't really transfer a significant percentage of the moon's energy to the asteroid to cause the moon's orbit to change.

A significantly large impact would increase the energy of the moon (as the moon is absorbing the kinetic energy of the asteroid), causing it to orbit further out.
If the asteroid hits the moon in a "head on" collision, the kinetic energy of the moon would be decreased and be converted into heat.

This would change its period and the timing of the tides. Also the tides would be smaller as the gravitational force from the moon would be smaller.

If the moon orbited closer to earth, the tides would be stronger. F=G*m1*m2/r^2 and all that.
 
2013-02-07 06:05:19 PM

namatad: SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.

ROFL
the fact that you even ASK this question is a sign that the understanding of science in the world ... well most people are dumb.

1) "take out the moon" - let's break that down
a) take out = moon magically disappeared, no fragments. poof tides caused by the moon would go away. there would possibly be some residual oscillation, but that would quickly dampen. Quakes caused by this would probably not be an issue. life requiring the tides to survive would suffer. life requiring moonlight for breeding and what no would suffer.
but this would be the best case

b) take out = blow to pieces. well ... this would take a HUGE asteroid moving at a large delta-V. which we would already have seen and know was coming decades in advance. but going with the case
the pieces would SHATTER. some would go up and out, some would come down, some would form an AWESOME asteroid belt/ring around the earth for a rather long time. Satellites would become a thing of the past, along with the space station.

BUT, the pieces which rained down? well we would be farked. even a small percent hitting the earth would royally fark us.

2) the same tiny asteroid missing us but hitting the moon.
MEH
a) there would be moonquakes, which would have no impact on us
b) there would be ejecta, some of which would rain down on the earth, but we are talking much smaller pieces, smaller than the impacting asteroid, and in the end, meh
c) this would only be a problem for us if the impact was on the near side of the moon. if it were on the dark side of the moon, there would be the ringing of many alarms

tl;dr
nothing would happen to us


man, you're a condescending ass.
 
2013-02-07 06:10:29 PM

madgonad: namatad: 2) the same tiny asteroid missing us but hitting the moon.
MEH
a) there would be moonquakes, which would have no impact on us
b) there would be ejecta, some of which would rain down on the earth, but we are talking much smaller pieces, smaller than the impacting asteroid, and in the end, meh
c) this would only be a problem for us if the impact was on the near side of the moon. if it were on the dark side of the moon, there would be the ringing of many alarms

Okay, that just made my whole day.

Anyway, I have a long-standing argument with some 'smart' friends of mine about the moon breaking-up scene in the travesty that is the recent Time Machine movie. My argument was that not only could we NOT break the moon up using subterranean nuclear explosion, but even if we COULD rip the moon in half - it wouldn't break up. It would just pull itself back together again due to gravitational attraction. The amount of energy to move the moon much closer to the earth AND disperse huge chunks of it is simply not going to happen with 'nuclear weapons' of any scale.


This, with the proviso that the initial blast could accelerate fragments out of the moon's gravity well. The total gravity of the moon is the same for a solid body as it is for an aggregate collection of bodies.
 
2013-02-07 06:32:27 PM
oldfarthenry

That's it! I'm buying a military assault weapon to protect me & my family from asteroids!

Not to worry. Obamacare will take care of you.
 
2013-02-07 06:34:12 PM

namatad: SlothB77: I always hear about astronomers gauging the likelihood something will hit earth.  What if something misses earth, but takes out our moon?  Wouldn't that be pretty bad for us too?  Tides and such as.

ROFL
the fact that you even ASK this question is a sign that the understanding of science in the world ... well most people are dumb.

1) "take out the moon" - let's break that down
a) take out = moon magically disappeared, no fragments. poof tides caused by the moon would go away. there would possibly be some residual oscillation, but that would quickly dampen. Quakes caused by this would probably not be an issue. life requiring the tides to survive would suffer. life requiring moonlight for breeding and what no would suffer.
but this would be the best case

b) take out = blow to pieces. well ... this would take a HUGE asteroid moving at a large delta-V. which we would already have seen and know was coming decades in advance. but going with the case
the pieces would SHATTER. some would go up and out, some would come down, some would form an AWESOME asteroid belt/ring around the earth for a rather long time. Satellites would become a thing of the past, along with the space station.

BUT, the pieces which rained down? well we would be farked. even a small percent hitting the earth would royally fark us.

2) the same tiny asteroid missing us but hitting the moon.
MEH
a) there would be moonquakes, which would have no impact on us
b) there would be ejecta, some of which would rain down on the earth, but we are talking much smaller pieces, smaller than the impacting asteroid, and in the end, meh
c) this would only be a problem for us if the impact was on the near side of the moon. if it were on the dark side of the moon, there would be the ringing of many alarms

tl;dr
nothing would happen to us


There are no dumb questions just dumb answers.

Not everyone knows much about astrophysics - in fact most people don't. How much do you know about 7th century Chinese art? How would you feel if someone ridiculed you for asking a newbie question about 7th century Chinese art?
 
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