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 What if an asteroid hit the Earth?

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مُساهمةموضوع: What if an asteroid hit the Earth?   الخميس أبريل 26, 2012 2:36 am

1What if an asteroid hit the Earth?



An asteroid striking our planet -- it's the stuff of science fiction.
Many movies and books have portrayed this possibility ("Deep Impact,"
"Armageddon," "Lucifer's Hammer," and so on).

An asteroid impact is also the stuff of science fact. There are obvious
craters on Earth (and the moon) that show us a long history of large
objects hitting the planet. The most famous asteroid ever is the one
that hit Earth 65 million years ago. It's thought that this asteroid
threw so much moisture and dust in to the atmosphere that it cut off
sunlight, lowering temperatures worldwide and causing the extinction of
the dinosaurs.

So, what if an asteroid were to hit Earth today?

Any asteroid falling from the sky would have a tremendous amount of
energy. Here's a typical example. In 2028, the asteroid 1997XF11 will
come extremely close to Earth but will miss the planet. If something
were to change and it did hit Earth, what you would have is a mile-wide
asteroid striking the planet's surface at about 30,000 mph. An asteroid
that big traveling at that speed has the energy roughly equal to a 1
million megaton bomb. It's very likely that an asteroid like this would
wipe out most of the life on the planet.

A rendering of an asteroid colliding with Earth.

Photodisc/Getty Images

It's difficult to imagine 1 million megatons, so let's try some smaller
sizes. Let's say that an asteroid the size of a house crashed on Earth
at 30,000 mph. It would have an amount of energy roughly equal to the
bomb that fell on Hiroshima -- perhaps 20 kilotons. An asteroid like
this would flatten reinforced concrete buildings up to half a mile from
ground zero, and flatten wooden structures perhaps a mile and a half
from ground zero. It would, in other words, do extensive damage to any
city.

If the asteroid is as big as a 20-story building (200 feet on a side),
it has an amount of energy equal to the largest nuclear bombs made today
-- on the order of 25 to 50 megatons. An asteroid like this would
flatten reinforced concrete buildings five miles from ground zero. It
would completely destroy most major cities in the United States.

By the time you get up to a mile-wide asteroid, you are working in the 1
million megaton range. This asteroid has the energy that's 10 million
times greater than the bomb that fell on Hiroshima. It's able to flatten
everything for 100 to 200 miles out from ground zero. In other words,
if a mile-wide asteroid were to directly hit New York City, the force of
the impact probably would completely flatten every single thing from
Washington D.C. to Boston, and would cause extensive damage perhaps
1,000 miles out -- that's as far away as Chicago.

The amount of dust
and debris thrown up into the atmosphere would block out the sun and
cause most living things on the planet to perish. If an asteroid that
big were to land in the ocean, it would cause massive tidal waves
hundreds of feet high that would completely scrub the coastlines in the
vicinity.

In other words, if an asteroid strikes Earth, it will be a really,
really bad day no matter how big it is. If the asteroid is a mile in
diameter, it's likely to wipe out life on the planet. Let's hope that
doesn't happen anytime soon!
http://science.howstuffworks.com/nature/natural-disasters/asteroid-hits-earth.htmads
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مُساهمةموضوع: رد: What if an asteroid hit the Earth?   الأحد يناير 06, 2013 12:21 pm

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What if an asteroid hit the Earth?

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