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Showing posts with label asteroids. Show all posts
Showing posts with label asteroids. Show all posts

April 18, 2012

Astronomers discovered the asteroid 2012 HM who comes to Earth in April


The recently discovered asteroid 2012 HM neighbor happen to the Earth 1.5 times the distance of the Moon on April 28, reports the Program report Near Earth Objects (NEO) of NASA.

The object will pass 576 000 km from Earth at a sufficient distance that could eventually be affected by the gravity of the Earth or Moon.Its closest approach to the moon will be 375,000 miles the morning of April 28 after an hour and will approach the Earth to move away quickly.

The asteroid 2012 HM is about 50 to 100 meters and traveling at a speed of 6.44 km / s.The NEO studied by space objects, comets and asteroids are driven by the gravitational pull of planets in close orbits that allow them to enter the vicinity of Earth.

They are composed mainly of water ice with embedded dust particles.While comets are formed in the cold outer planetary system, most of the rocky asteroids have formed in a zone warmer inner solar system between the orbits of Mars and Jupiter.

The scientific interest in comets and asteroids is that they are a remnant material that has not undergone major changes in the process of formation of the solar system some 4.6 billion years.

One hypothesis is that the giant outer planets comoJúpiter, Saturn, Uranus and Neptune formed from an agglomeration of billions of comets and the remnants of this formation process are the comets we see today.
From this perspective posed by NEOs, asteroids today are the pieces left over from the initial agglomeration of the inner planets, including Mercury, Venus, Earth and Mars.

"Comets and asteroids offer clues to the chemical mixture from which the planets formed some 4.6 billion years. If we know the composition of the primordial mixture from which the planets were formed, then we must determine the chemical components of the remaining remnants of this formation process, comets and asteroids, "says NASA.

April 11, 2012

The threat of asteroid 99942 Apophis


The Russian Academy of Sciences just issued a report suggesting the sooner send a satellite equipped with a beacon to the asteroid 99942 Apophis, considered the most dangerous for the Earth and whose orbit will take you to pass very close to our planet in the years 2029, 2036 and 2068.

The mission objective is none other than find out, no doubt, once and for all, the actual level of threat this space rock about 300 feet in diameter is for us. "From the technical point of view, the mission could be ready for deployment in 2015," said the statement from the Academy.

Apophis will pass in April 2029, only 29,450 km. of the earth. Discovered in 2004, will hold its first "pass" by Earth next April 13, 2029, at a distance of only 29,450 km, representing a record of close to these objects. However, this first visit will be harmless and the risk of impact for that year, although there would be negligible.

The problem comes later. In fact, astronomers know that, precisely because of its proximity aa at that time, the asteroid's trajectory will be affected by the force of gravity. This could lead to an impact for any of the following two visits.

The point is that in the absence of accurate data, it is not possible to make accurate estimates. In other words, we still do not really know how dangerous this asteroid.

In its latest estimate, released in October 2009, NASA stood at 250,000 a probabbilidades impact of Apophis hitting the Earth for 2036, and 333.000 for its passage in 2068. However, NASA itself believes that these estimates may not be subject to the availability of data on the asteroid's approach in 2029.

Sending a satellite will serve to dispel doubts. According to the report of the Russian Academy, sending a satellite to the asteroid will serve to dispel doubts and calculate the exact path of the asteroid. The instruments could, once known to detail their orbital data, make predictions much more reliable for the next meeting and clarify what the real possibilities of impact for 2036.

Other investigators have previously proposed space missions for the same purpose. One, which was never implemented, was to place scientific equipment directly on the surface of the asteroid, which would monitor the data continuously. The mission now proposed by Russia, however, has the advantage of being much cheaper and easier from the technical point of view.

With a size which triple that of a football field, Apophis is, however, a small asteroid, especially compared to bodies like Ceres, which has nearly a thousand miles. in diameter.

However, a direct impact with Earth would be capable of causing severe damage, especially if they occur in densely populated areas. Suffice to say that the energy released would be equivalent to tens of thousands of atomic bombs.

March 29, 2012

Scientists propose a 'shield against asteroids' using squadrons of small satellites


Scientists at the University of Strathclyde (Glasgow, Scotland) have found a more effective method to create a 'shield against asteroids' in space around Earth to avoid impacts on the planet.

Currently research is aimed at creating huge-and impractical for this mission-spacecraft with large laser devices on the ends.

But researchers at Glasgow have reached the conclusion that it would better to use a small satellite squadrons 'combat' capable of accompanying the asteroid and shoot simultaneously with high power lasers from a short distance.

Among the advantages of this idea is shown that is easier to create a large fleet smaller than a ship and, secondly, in the event that one of the satellites is damaged see column of waste produced by the collision of the laser beams against floor of the asteroid, others can continue their work unhindered.

The danger is real. The space objects of medium size, white satellite system, are capable of causing visible damage to the Earth. Just a century ago an asteroid 30 to 50 meters in diameter destroyed life in an area of ​​2,000 km in a village in Siberia, Tunguska.

Besides fighting the stones from the cosmos, the British project has another practical application. Scientists hope to be able to neutralize or lower the orbit of space debris, such devices that threaten the devices in the near-Earth space, such as the International Space Station, which recently managed to avoid a dangerous clash of that type.

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