Double Dipping Brazilian Wax

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Out there in space, there are over 7,200 asteroids and comets whose orbit interferes with our planet and which could eventually reach collide. More than 800 have size enough to cause a global disaster in case of impact.

"A body of between 15 and 20 meters of silicates, usually explode in the atmosphere before they collide, but if metal, things change: create an impact crater about 1,200 feet in diameter and 170 meters, with estimated energy of 1.6 megatons, "said Jesus Martinez Frias, a planetary geologist at the Center for Astrobiology and the National Institute of Aerospace Technology (INTA).

Much of the large asteroids (75%) is located and none of them has a totally dangerous orbit, the remaining 25%, approximately 300 is difficult to escape the supervision to be subjected because of their large size.

For now, only look with some concern the asteroid Apophis, which, depending on the thermal and gravitational perturbations, could make an impact with Earth in 2036. The latest estimates show that the probability of impact with the Earth is one in 250,000; of time.

There are several hypothetical ways to get rid of an asteroid on impact, but the most feasible, is the planetary defense mission "Don Quixote", treated in 2008 in Granada and prepared for European Space Agency (ESA) by a English company. The mission is to send two ships:
Sancho,
the main ship, arrives first, look at the characteristics of the body and establishes a network of seismometers on the surface;

Hidalgo,

months later, his 380kg star into the asteroid to to alter its orbit and rotation.

But scientists, not just observe and analyze these bodies from Earth. Last December, was released on NASA's WISE, which, to date, has discovered 19 comets and asteroids over 33,500.

Information obtained from the journal "XL Weekly" of Oct. 24.

Version: I've been looking for more current information on this mission previously mentioned, but I have not been able to find, the latest I could find was this, and any other article of 2007:

http://www.hoytecnologia.com/noticias/mision-Quijote-esta-suspenso/32373