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Close Shave #1042600
10th Aug 2017 8:06pm
10th Aug 2017 8:06pm
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Birkenhead
diggingdeeper Offline OP

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diggingdeeper  Offline OP

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A house sized asteroid passing us at only an eighth of the distance to the moon, that is a close shave.

It passed pretty close in 2012, lets hope it doesn't get even closer in 2022, maybe it could be pretty bad if it hits the moon.

SOURCE


In a time of universal deceit - telling the truth is a revolutionary act. George Orwell

We should judge our economy by the absence of poverty, not the number of billionaires - Jeremy Corbyn
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Re: Close Shave [Re: diggingdeeper] #1042690
11th Aug 2017 8:18pm
11th Aug 2017 8:18pm
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granny Offline
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Asteroid the size of a house will shave past earth in October, inside the moon's orbit.

Now that doesn't mean a lot to me, but this does. cry

In the Book of Revelation chapter 8 there is a description of what appears to be a comet or asteroid hitting earth, and the resulting wordwide destruction:
"8:7 The first angel sounded, and there followed hail and fire mingled with blood, and they were cast upon the earth: and the third part of trees was burnt up, and all green grass was burnt up.
8 And the second angel sounded, and as it were a great mountain burning with fire was cast into the sea: and the third part of the sea became blood;
9 And the third part of the creatures which were in the sea, and had life, died; and the third part of the ships were destroyed.
10 And the third angel sounded, and there fell a great star from heaven, burning as it were a lamp, and it fell upon the third part of the rivers, and upon the fountains of waters;
11 And the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter.
12 And the fourth angel sounded, and the third part of the sun was smitten, and the third part of the moon, and the third part of the stars; so as the third part of them was darkened, and the day shone not for a third part of it, and the night likewise."


Humankind has not woven the web of life. We are but one thread within it. Whatever we do to the web, we do to ourselves. All things are bound together. All things connect.
~Chief Seattle
Re: Close Shave [Re: diggingdeeper] #1042692
11th Aug 2017 8:34pm
11th Aug 2017 8:34pm
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diggingdeeper Offline OP

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This is only the size of the one that hit Russia a while back, no Armageddon involved, you can put your apocalyptic texts away and give your worry beads a rest.


In a time of universal deceit - telling the truth is a revolutionary act. George Orwell

We should judge our economy by the absence of poverty, not the number of billionaires - Jeremy Corbyn
Re: Close Shave [Re: diggingdeeper] #1042696
11th Aug 2017 8:46pm
11th Aug 2017 8:46pm
Joined: Jan 2010
Posts: 1,635
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Excoriator Offline
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According to the laws of physics, the velocity is much more important than the mass. Double the mass, and you get double the energy released (this is what causes the damage). But double the speed and you get FOUR TIMES the energy. Treble the speed and you get NINE TIMES the energy and so on.

In theory, an asteroid the size of a car could wipe us all out if it were going fast enough. How likely is this? I have no idea, and neither has anyone else. It hasn't happened yet which might imply it is pretty unlikely, but that doesn't mean it won't happen five minutes from now.

Try not to worry.


Re: Close Shave [Re: diggingdeeper] #1042698
11th Aug 2017 8:57pm
11th Aug 2017 8:57pm
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Birkenhead
diggingdeeper Offline OP

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Not quite that simple, if it comes in too fast the air protects us to a greater extent, many asteroids just explode at high altitude without any sizeable lumps hitting earth.


In a time of universal deceit - telling the truth is a revolutionary act. George Orwell

We should judge our economy by the absence of poverty, not the number of billionaires - Jeremy Corbyn
Re: Close Shave [Re: diggingdeeper] #1042700
11th Aug 2017 9:00pm
11th Aug 2017 9:00pm
Joined: Jun 2011
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granny Offline
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Originally Posted by diggingdeeper
This is only the size of the one that hit Russia a while back, no Armageddon involved, you can put your apocalyptic texts away and give your worry beads a rest.


raftl snapped my worry beads a while back.


Humankind has not woven the web of life. We are but one thread within it. Whatever we do to the web, we do to ourselves. All things are bound together. All things connect.
~Chief Seattle
Re: Close Shave [Re: diggingdeeper] #1042703
11th Aug 2017 10:33pm
11th Aug 2017 10:33pm
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fish5133 Offline
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In the big bang theory of evolution (if that's what you believe) our planet is approx. 4.6 billion years old. Given the huge numbers of so called evolutionary changes to turn us from algae soup to homosapien and all the other species I find it difficult to understand why 1 random event, in that 4.6billion years, of a huge meteor/asteroid has not destroyed us.

Re: Close Shave [Re: fish5133] #1042705
12th Aug 2017 12:03am
12th Aug 2017 12:03am
Joined: Jul 2008
Posts: 12,476
Birkenhead
diggingdeeper Offline OP

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diggingdeeper  Offline OP

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Originally Posted by fish5133
In the big bang theory of evolution (if that's what you believe) our planet is approx. 4.6 billion years old. Given the huge numbers of so called evolutionary changes to turn us from algae soup to homosapien and all the other species I find it difficult to understand why 1 random event, in that 4.6billion years, of a huge meteor/asteroid has not destroyed us.


There have been at least 5 mass extinctions on earth with over 60% of species wiped out on each occasion and we have very little knowledge of what happened more than 0.5 billion years ago.

We are so dependent on technology and piped energy now that there would be little chance of long term human survival if any of those previous events recurred.

End-Ordovician, 443 million years ago

A severe ice age led to sea level falling by 100m, wiping out 60-70% of all species which were prominently ocean dwellers at the time. Then soon after the ice melted leaving the oceans starved of oxygen.

Late Devonian, c 360 million years ago

A messy prolonged climate change event, again hitting life in shallow seas very hard, killing 70% of species including almost all corals.

Permian-Triassic, c 250 million years ago

The big one more than 95% of species perished, including trilobites and giant insects strongly linked to massive volcanic eruptions in Siberia that caused a savage episode of global warming.

Triassic-Jurassic, c 200 million years ago

Three-quarters of species were lost, again most likely due to another huge outburst of volcanism. It left the Earth clear for dinosaurs to flourish.

Cretaceous-Tertiary, 65 million years ago

An giant asteroid impact on Mexico, just after large volcanic eruptions in what is now India, saw the end of the dinosaurs and ammonites. Mammals, and eventually humans, took advantage.


In a time of universal deceit - telling the truth is a revolutionary act. George Orwell

We should judge our economy by the absence of poverty, not the number of billionaires - Jeremy Corbyn

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