1 light years is the number of kilometers?

Light years, length units, refers to the light in a year to go the distance, that is, about 9460000000000 kilometers (or 588 billion miles), more formally defined as: in a Ruonian time (ie 365, 25, And the daily equivalent of 86400 seconds), in the free space and distance from any gravitational field or magnetic field infinity, a photon walking distance.

Because the speed of light in the vacuum is 299,792,458 meters per second (accurate), so a light year is equal to 9,460,730,472,580,800 meters (accurate), or about equal to rice two 9,46 Meter.

Light years are generally used to measure a large distance, such as the solar system with another perseverance distance. Light years are not units of time, in astronomy, the second gap is a very common unit, a second gap is equal to 3,26 light years. A light year is equal to 63,240 astronomical units.

With a distance of 9,456.8 million kilometers (the speed of light in the vacuum is constant about 300,000 km / s)

Calculated by: a light year two 365x24X60X60X30W

Light from the sun to reach the Earth takes about eight minutes (that is, the distance between the Earth and the sun is eight "light points").

It is known that the nearest star of the solar system is Centaur, which is 4,22 light-years away.


It would take more than a hundred thousand years from the end of the Milky Way to one end of the Milky Way from the Milky Way, but it was only for the still observers (relative to the Milky Way) that the crew felt the journey Only a few clocks, this is due to the special relativity of the mobile clock in the time of the phenomenon of expansion.

It is seen that the straightness of the universe is about 15 billion light years.