Original by steve carlip 1997 and philip gibbs 1996. Weve all asked this question at some point in our lives.
The short answer is that it depends on who is doing the measuring.
How long to travel a light year at the speed of light. Because it includes the word year the term light year is. How long would it take to travel to the stars. You cannot talk about the speed of light without defining your frame of reference.
However at speeds very close to that of light the effect grows in magnitude very rapidly indeed until time almost comes to a standstill. The measured speed of light in local inertial frames is 299792458 kmsec. The speed of light is very close to 300000 km per second 186300 miles per second.
Physics faq updated 2014 by don koks. Could it be within a persons own lifetime and could this kind of travel become the. As defined by the international astronomical union iau a light year is the distance that light travels in vacuum in one julian year 36525 days.
The speed of light in vacuum commonly denoted c is a universal physical constant important in many areas of physicsits exact value is 299792458 metres per second approximately 300000 kms 186000 misit is exact because by international agreement a metre is defined to be the length of the path travelled by light in vacuum during a time interval of 1299792458 second. Is the speed of light everywhere the same. For ftl drives that travel to their destination at a certain rate as opposed to jump drives that appear instantly at the destination science fiction authors generally talk about how much faster than the speed of light in a vacuum the starship travels.
The speed of light is only guaranteed to have a value of 299792458 ms in a vacuum when measured by someone situated right next to it. Its somewhat belated but relevant data nevertheless the results of a 2001 united kingdom survey that reveal that motorists put light rail top of the list of preferred transport alternatives in the words of a summary of the report in tramways urban transit of june 2001. So if you want to make a comparison with 299792458 kmsec then you have to make it in a local inertial frame.
A single light year is an inconceivable abyss. Special relativity requires the frame of reference to be inertial travel in a straight line. It isnt until we get to speeds that are a large fraction of the speed of light that any change in the flow of time becomes apparent.
Motorists prefer light rail over buses reports uk poll. At an ordinary speed say a reasonable pace for a car in a megalopolitan traffic two kilometers per minute you would consume almost nine million years in crossing it. The light year is a unit of length used to express astronomical distances and measures about 946 trillion kilometres 946 x 10 12 km or 588 trillion miles 588 x 10 12 mi.
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