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Do you know what is a light-year?

A light-year is the concept that we often hear when talking about the distance between the planets or stars in the universe. In fact, a light-year unit is mainly due to the distance used in astronomy. Do you know what is a light-year? And what can we do with a light-year?
A light-year is the distance light that light pass in vacuum after a year Julius (about 31.557.600 s)

Since the speed of light in vacuum with a value of about 299.792.458 m/s, a light-year corresponding to approximately: 9.460.730.472.580,8 km

This is one extremely large distances. The average distance between the Sun and the Earth is approximately 149.6 million kilometers (1 AU astronomical units), light only takes about 8 minutes and 19 seconds to travel from the sun to the earth.

Sun and Earth

Of course, ordinary people do not need to use a unit of measurement such large distances. Diameter of the Earth at the equator is 12.756 km, much smaller than a light-year. But if you measure the distance between entities in the universe is another matter. The star closest to Earth to be about 4,3 light-years.
If you compared to the distance in the universe, one light year is still one very small distance. the breadth of our galaxy about 100.000 light-years.
And the breadth of the universe, human beings have not yet been specifically identified, and the scientists hypothesized that the universe was still in the process of expanding. Part human universe observed with a radius of about 13,7 billion light-years (corresponding to around 130 yotamet).

Currently the scientists are trying to identify planets likely exist or have sufficient conditions to support life development. This has had positive results. Recently, scientists University of New South Wales (UNSW), Australia uses telescope of European Space Research Organisation in La Silla, Chile, they found the star Wolf 161, one in three satellites of this star is named Wolf 1061c and it located in the "Goldilocks zone", zone of the space might have water in liquid form, can support life. Distance between this planet and the Earth about 14 light-years, much closer than the planets can support life detected previously.

Actually, people are trying to search for planets close to Earth, that can support life. At the same time improving the speed of the spacecrafts, or find other ways to transport to people can set foot on that planet. The search for planets like Earth, the planets may have conditions for development life going on rather favorable. More such planets have been scientists find, they are increasingly closer to Earth. However, improving the speed and manner of our transportation is still very difficult problem, the maximum speed of existing human remains too small compared to the speed of light, almost equal to 0 if brought compare. Hope to speed quickly technological progress as today, in the shortest time scientists will find a way.