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Copy of Tutankhamun's tomb

17.11.2011

The breath of thousands of tourists visiting King Tutankhamun's tomb in the Valley of the Kings near Luxor is damaging the frescoes on its walls. Therefore, it was decided to make an exact copy of the famous object of antiquity.

The Spanish restoration firm Factum Arte, known for making a copy of the Altamira Cave in Spain in 2001, where moisture and carbon dioxide released by the breath of visitors spoiled Stone Age cave paintings, took up the matter.

In November 2009, the Italians delivered several tons of equipment to Egypt and got to work. The walls of the tomb and the sarcophagus were scanned by a specially designed three-dimensional laser scanner with a resolution of one hundred million points per square meter. Made 8000 digital macro photographs with a resolution of 600-800 dpi (the resolution of the human eye is about 250 dpi). Then, according to the scan data, a computer-controlled milling machine cut out the exact relief of the walls of the burial chamber and the sarcophagus on blocks of polystyrene. They were pasted pictures printed on a special sheet material that easily sticks to uneven surfaces.

The finished copy will be delivered from Madrid to Egypt when political passions subside in that country. The original tomb is planned to be closed to everyone except archaeologists and very wealthy tourists who are ready to pay several thousand dollars for a visit.

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Jupiter diverts comets and sends asteroids to Earth 18.03.2012

The French mathematician Pierre Simon Laplace once calculated that comets experience many encounters with Jupiter. It is believed that Jupiter's gravity protects the Earth by "throwing" many comets out of the solar system. Until now, no one doubted this, but new computer simulations by scientists from the University of New South Wales and the Open University of Great Britain open up new aspects of this process, which is of great importance for the Earth and other planets. Simulations have confirmed that Jupiter protects the Earth from long-period comets, but this is not the case for short-period comets and asteroids.

Most asteroids move in stable orbits around the Sun, and Jupiter causes a gravitational resonance between the giant planet and the asteroid belt. Thus, Jupiter "captures" the "walking" asteroids and sends them away from the zone of gravitational resonance.

In their computer model, the scientists changed the mass of Jupiter and found that the lower the mass of the planet, the wider the resonance and the more perturbation it causes in the asteroid belt. Thus, the largest number of collisions of asteroids with the Earth is observed when the mass of the simulated Jupiter is one fifth of the mass of the real Jupiter. A further decrease in mass leads to a drop in the strength of gravitational resonance, and it can no longer significantly affect the trajectory of asteroids.

A similar result is also observed for short-period comets. At present, Jupiter's gravity is capable of throwing comets in the direction of the Earth, as happened with Lexell's comet, but Jupiter plays the role of a cosmic "vacuum cleaner", cleaning the solar system of cometary debris. If Jupiter had only one-fifth of its real mass, it would still be able to send comets to Earth, but it would lose the ability to clear the system of comets.

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However, things could have turned out much worse for us: if Jupiter had only 20% of its mass, the bombardment would increase significantly and our planet would become uninhabitable. So when looking for potentially habitable planets, we should avoid systems that contain planets 0,2 Jupiter masses and at the same distance from the star.

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