Australian researcher saves the world
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An Australian researcher has won an international prize for her plan to wrap a giant asteroid with reflective sheeting to stop it colliding with the earth and destroying all life.
Such an impact would have the force of 110,000 Hiroshima atomic bombs if the asteroid, which actually exists, hits the planet in 2036, said Mary D'Souza, a PhD student with the University of Queensland's School of Engineering.
Far from being daunted by the prospect of global annihilation, Ms D'Souza went to work on a possible solution and took out the top prize in an international competition to find new ways of stopping asteroids from hitting Earth.
She beat entries from around the world in the Space Generation Advisory Council's Move An Asteroid 2008 competition and will travel to Glasgow at the end of September to present her plan at the International Astronautical Congress, the world's largest space conference.
Her proposal involves using enhanced solar radiation pressure to move the threatening asteroid off its path to Earth by wrapping it with Mylar film, "a step up from Kevlar", she said.
The solar reflecting material is already used on satellites.
Satellites also could do the wrapping.
"I'm using a satellite that's orbiting the asteroid and the rotation of the asteroid itself to wrap this ribbon," Ms D'Souza said today.
"So it's kind of like it wraps as it rotates."
The Mylar film covering just 50 per cent of the asteroid would change its surface from dull to reflective, a necessary step to harness the power of the sun.
"What happens then is light from the sun shines on the body (of the asteroid) so more of it is reflected ... and it actually acts to move it away from the sun and the earth."
The asteroid is 330 metres in diameter, only a fraction of the 10km wide asteroid which some scientists say caused the weather event which led to the extinction of the dinosaurs.
But having a 330 metre asteroid hit the planet did not bear thinking about.
"We'd rather not consider that," she said.
"It's kind of like a very, very, bad day for earth.
"Scientists say if it did impact the earth, it would carry the force of 110,000 Hiroshima bombs."
The rogue asteroid spends most of its time on the other side of the sun to the earth and the next observation period would be in 2011, Ms D'Souza said.
"At that time we'll probably be able to refine its orbit and determine how likely it is to hit the earth.
"If this one were to hit the earth, you could say that most of life would be extinguished," Ms D'Souza said.
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źródło:
http://www.smh.com.au/news/science/local.....85371.html
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