A cosmic collision might fade away the water

A cosmic impact might have been the cause of a temporary warming of Mars and, therefore, the disappearance of water on its surface, according to a study published in international 'Astrobiology Magazine. Experts have said that this discovery could help explain how a planet so cold and dry ever could contain liquid water and potentially favorable conditions for life.

A collision with an asteroid 2012 DA14 threat to Earth on February 15, 2013

According to this calculations, the orbit of the asteroid with a diameter of between 40 and 95 meters, cross the Earth orbit. Astronomers have calculated that the February 15, 2013, the asteroid will pass only 26 900 kilometers of our planet, which is lower than the orbits of geostationary satellites (about 35,000 kilometers). A recharcher said that 2012 DA14 "belongs" to the regular type asteroids approaching Earth from behind, then or later, in front of him. 

"These are objects that move from time to time near the Earth in fact, they do not go around the earth, but in a coordinate system with two centers (with the Sun and Earth) will be like to turn around Earth, "he quoted. Now it is impossible to predict what will happen in the encounter with Earth in 2012 DA14. "We have to see it, can be farther from the Earth, then closer, even enough to fall to the ground, with some probability that impact the Earth.