Friday, March 25, 2011
Wednesday, March 23, 2011
Microlights Blueprints
The dimensions of the Solar System
The solar system is enormous . So much so that its dimensions are beyond the ability of our brain to imagine what is meant by such large numbers. To say that the Earth is more than 149 million miles from the sun is not enough to give us an idea of \u200b\u200bwhat it really represents that distance. When we read that the Sun has a diameter of just under a million and a half miles, your mind is not enough to visualize what this size means. And the little film that we mentioned earlier help us in this task, because we give the erroneous impression that the Sun is few times larger than the Earth, or Pluto is considerably further from the Sun Mars. But the Solar System dimensions are impressive enough to make it completely impossible to make a representation to scale and include it in a sheet of textbook: if we did, the planets are not visible not even using a magnifying glass.
To better understand the sizes and distances involved we compare the most important objects of the system Solar with other everyday. We begin, as appropriate, with the pair greatest influence on our lives: Earth and the Sun know that our planet has a diameter of about 12,750 kilometers, which is about 150 billion meters away from the Sun Assume for a moment that the Earth has the approximate size of a tennis ball. On this scale, the Sun would be an area of \u200b\u200babout seven meters in diameter, which is about 1200 miles away. That is the challenge faced by managers illustrate the dimensions of the Solar System. If we keep doing calculations keeping the distances between planets and their size in the same scale the previous example, we are back in trouble: if the Earth was a 1200 miles from the sun, Pluto would be about forty-seven thousand and about the size of a marble. Clearly we need a scale for distances, and another, completely different to the diameter of the Solar System bodies .
Port Royale Update 1.1.0.89
NASA estimates that at least 2,000,000,000 Land inhabit our galaxy
Given the size of the Milky Way and Earth-like exoplanets found so far, NASA estimates that there are 2,000 million planets with Earth-like conditions only in this galaxy.
De According to the findings of a new scientific study seems to Sun-like stars in our galaxy are often beside Land. It is estimated that between 1 in 37 and 1 of 70 of them contain these extrasolar planets in their orbits.
yellow dwarf stars, therefore, may be the most suitable type of cosmic fireball that allows the development of a planet similar to ours. The reason why astronomers look for these objects is that they are more likely to meet some of the conditions required for life.
The thinking behind the search is simple: find the elements that make the Earth able to support life and then look elsewhere in the universe . There are literally thousands of these conditions, but experts are currently looking for the most important.
These include the location of an exoplanet with respect to its star's habitable zone, its size and chemical composition, the type of atmosphere that has, on its surface gravity, the presence of a liquid core and many more .
As a result of the latest calculations, maybe even 2 million land may exist in the Milky Way. It is estimated that the galaxy is 100,000 light years in diameter and contains between 100 and 400 billion stars.
The new study's conclusions are based on the data returned by the telescope planet hunter NASA's Kepler, who recently revealed the existence of 1,200 candidates exoplanetary.
The proportions of the stars analyzed for the study were compared with the number and types of planets discovered around each, and resulted in a graph of probabilities.
"This means that there are a lot like Earth out there. So many, there is a strong possibility that life exists and perhaps could be even intelligent life in some of these planets, "says Joseph Catanzarite (Space.com reports.)
"And that's just in our galaxy, know that there are 50 million other galaxies " adds the researcher, who is an astronomer at NASA , Jet Propulsion Laboratory (JPL) in Pasadena, California.
The new research also found that red dwarfs may also contain terrestrial exoplanets. The only difference in these stellar systems would be space rocks should be much closer to the surface of their parent stars, due to lower amounts of heat they emit.
"I found out one day of Similar habitable land around stars, "said Catanzarite. He and Michael Shao expert published a paper detailing their analysis in the online edition of 8 March Astrophysical Journal .
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