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Asteroid

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By (user no longer on site) OP   
over a year ago

When they make the obligatory disaster movie about an asteroid heading for earth, the general answer is to hit it with lots of nuclear missiles and make it smaller, or land on it plant a nuclear bomb etc.

BUT an explosion is effectively a very fast fire, and fire needs oxygen, so would it work? would any earth knowledge based explosion actually explode in space?

Sorry mind wandered from the global warming thread...

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By (user no longer on site)
over a year ago

You like chemistry don't you?

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By *opinovMan
over a year ago

Point Nemo, Cumbria

I think, for an atmospheric nuclear explosion, it would only be the following firestorm that would require oxygen.

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By (user no longer on site)
over a year ago

Wouldn't work, if it's a huge one that will end existence, I might as well pull up a chair at the impact point. Sup a cold one and cuddle the Mrs before we're wiped out. At least go with a smile.

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By (user no longer on site)
over a year ago

It would be a nuclear reaction so I don't think it needs oxygen? The sun doesn't use oxygen does it?

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By (user no longer on site)
over a year ago

Normal explosion is in fact a very fast chemical reaction....correct in what you say. Needs oxygen or an oxidising agent as part of the mix.

Nuclear "explosion" is fission of atoms (uranium/plutonium etc) or fusion (hydrogen bomb). E(energy)=m(mass)c2

(C=Speed of light/300,000,000). The mass being how many kg of the nuke fuel is fissionable etc.

No oxygen needed whatsoever.

(Yes - I do have a physics degree)

In reality if we get to the asteroid etc far enough out we only need to deflect its path by a fraction of a degree to make it miss by a long way. The problem is spotting the dark object coming towards us out of black space. We may not get sufficient warning to do anything other than kiss our asses goodbye!

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By (user no longer on site)
over a year ago

I would think the efficiency would be down to the size of the asteroid too. We could end up with lots of smaller sized rocks hitting us and still doing extensive damage. I would have thought changing the trajectory of the whole asteroid would be better. The moon may get hit first do you think?

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By (user no longer on site) OP   
over a year ago

Yes I do like the sciences, Chemistry for the bad smells, Physics for the explosions and Linear motors I loved building them! and Biology for the squidgy stuff.

I understand that there would be a nuclear reaction on detonation... IF the detonator works in a vacuum, but would it be an explosion of any magnitude without the extra fuel of oxygen?

Would hate to fend off global warming, go through all the preparation and resulting media hype of launching all our nukes at the asteroid that is going to do to us what another did to the dinosaurs only for the impact to end up like a damp firework...

After all it would be sad if the world was to end with pfhuuut....... bugger!

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By (user no longer on site) OP   
over a year ago


"The moon may get hit first do you think?"

Now that would be worse in a lot of ways, the moon amongst it's many beneficial effects on the planet acts as a gravitational stabiliser. Without it the planet becomes a giant love egg with the iron core now acting as a giant vibrator... don't sit down you will orgasm to extinction

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By *eard-lincolnMan
over a year ago

near lincoln

I'm looking forward to them catching an asteroid to do experiments on it. They said they might try and hit the moon with it.

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By *rumCoupleCouple
over a year ago

birmingham

A lot of explosives have the oxygen they need already available in the compounds that make up the explosive (e.g. C4). So they would still work in space.

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By *rinking-in-laCouple
over a year ago

Bristol

[Removed by poster at 23/06/14 15:57:37]

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By *rinking-in-laCouple
over a year ago

Bristol

[Removed by poster at 23/06/14 15:57:32]

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By *rinking-in-laCouple
over a year ago

Bristol

We won't see an asteroid that is going to hit us till it hits us. Think of the meteorite which landed in a Russian region a few months back. No one saw that coming.

The Moon (which incidentally is not a Moon, the Earth is a double-Planet) is thought to be the product of a planet hitting us ages ago and a massive great chunk of earth broke off and became the Moon. That must have been messy.

Also nuclear explosions, as a physicist stated earlier, don't require oxygen to occur and the magnetude of the explosion would not be affected.

The fire which happens after a nuclear explosion is simply a function of the energy released by the explosion filling the air and lowering (is it lowering or raising? Chemistry folks please correct me if necessary) the enthalpy of combustion of the air such that is spontaneously combusts until the vast amount of energy dissipates.

It makes a right mess. We would be better doing away with nuclear weapons altogether rather than save them in case an otherwise unlikely holywood scenario realisrs itself. The world will be much safer on the whole.

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By *uited staffs guyMan
over a year ago

staffordshire

The further away it is the smaller the explosion needed to change it's course to miss us, conversely the nearer it is the bigger

And has been stated nuclear explosions don't need oxygen, most nuclear bombs we have are fission based and rely on the energy released when a uranium or plutonium atom is split

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By (user no longer on site)
over a year ago

It does make you wonder how the Earth will die. Will we just get colder and all life die or go out in an explosion

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By *igeiaWoman
over a year ago

Bristol


"It does make you wonder how the Earth will die. Will we just get colder and all life die or go out in an explosion "

The universe itself according to current scientific theory will eventually reach a heat death state of entropy at an atomic level and cease to be 'living' in the sense of atomic movement. The earth will be long gone by then though since it will be consumed as the sun expands to encompass it before it dies. That's a few billion years off though.

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By *uited staffs guyMan
over a year ago

staffordshire

But all life on earth will be dead long before that, the atmospheric carbon dioxide will eventually all be absorbed leaving nothing for the plants, which will die with the animals as well as we can't live without them

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By (user no longer on site) OP   
over a year ago

Just done a very small amount of google research, approximately 85% of the destructive force of nuclear weapons depends on atmosphere, not oxygen as such, but pressure and a medium to be compressed and released as a destructive wave. That plus the concept of

pfhuuut....... bugger!

being the last sign of life transmitted into the galaxy on Murdoch's universal news network causing me considerable amusement I am going to confidently predict that will be the end game

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By *rightonsteveMan
over a year ago

Brighton - even Hove!

Of cours it works! I've seen several movies where we all escaped because of the heroic antics of a few....

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By *rumCoupleCouple
over a year ago

birmingham


"It does make you wonder how the Earth will die. Will we just get colder and all life die or go out in an explosion "

Not all the heat planets get comes from the sun. Quite a bit is generated by the immense force of gravity compressing/releasing the planet as it rotates. There's moons of Saturn which have molten interiors from this mechanism.

Since heat *is* energy, it's entirely possible that life could evolve on planets which receive little or no sunlight. As long as there's liquid water.

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By *igeiaWoman
over a year ago

Bristol


"But all life on earth will be dead long before that, the atmospheric carbon dioxide will eventually all be absorbed leaving nothing for the plants, which will die with the animals as well as we can't live without them"

Apart from the deep sea tubeworms that exist on the sulphur from volcanic vents...

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By (user no longer on site)
over a year ago

If it happens then I'll be ready for the end of the world party!

Get your pants off and break out the lube!

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By (user no longer on site)
over a year ago

If it happens then I'll be ready for the end of the world party!

Get your pants off and break out the lube!

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By *uited staffs guyMan
over a year ago

staffordshire


"But all life on earth will be dead long before that, the atmospheric carbon dioxide will eventually all be absorbed leaving nothing for the plants, which will die with the animals as well as we can't live without them

Apart from the deep sea tubeworms that exist on the sulphur from volcanic vents..."

That's assuming there is any volcanic activity left by then!

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By (user no longer on site)
over a year ago


"Just done a very small amount of google research, approximately 85% of the destructive force of nuclear weapons depends on atmosphere, not oxygen as such, but pressure and a medium to be compressed and released as a destructive wave. That plus the concept of

pfhuuut....... bugger!

being the last sign of life transmitted into the galaxy on Murdoch's universal news network causing me considerable amusement I am going to confidently predict that will be the end game "
Perhaps the daily star might get a write up to...

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By *ophieslutTV/TS
over a year ago

Central

When it is spotted they just need to charge extra to travel on the virgin space flights. The ship will be tasked with pushing it off course, whilst the passengers can enjoy some dancing etc on the asteroids surface, sealing the deal to push it away. They can continue on with it, paying only for a single ticket. No nuclear device needed.

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By *bro07Man
over a year ago

Teesside

You can't nuke an asteroid it would make it more dangerous with the flying debris. If it was to happen then the most sensible and safest thing would be to to try and divert it somehow away from earth

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