1 A.U.= 1.49597870 x (10 to the 11th power) metres. The speed of light = 299792458 metres / second. So t=1 A.U. divided by c = 499 seconds or 8 minutes, 19 seconds. An Astronomical Unit is a little less than the average distance between the sun and the earth.
about 100,000 years.
Not actually. I don't know the exact amount of time, but let me put something else into perspective.
If light were to travel from one end of our universe to the other, traveling at roughly 180,000 miles per second (or 300,000 kilometres per second), it would take about 10,000 years.
So in perspective, maybe like 100 years, maybe less.
An astronomical unit (AU) is the distance between the Earth and the Sun, and is set at 92,963,314.36 miles. The speed of light is defined as 186,282.397 miles per second. So dividing 1 AU by this speed gives a time of 499.0450835 seconds for light to cover that distance. Dividing this value by 60 gives a value of 8.317418058 minutes, or 8 minutes and 19 seconds.
(100 billion light years) x (5.8787 x 1012 miles per light year) = 5.8787 x 1023miles.
But wait! Don't go away disappointed. We know you posted this nonsense question on
WikiAnswers in order to see a big number, and we aim to please. So, here is the same
answer again, written this time in 'standard' form rather than scientific form.
100,000,000,000 light years = 587,870,000,000,000,000,000,000 miles (rounded)
There you are. A distance 7.7 times farther than the radius of the observable universe. How cool is that !
In order for a beam of light to cross the entire known universe, it would take somewhere between 30-36 billion years. However, in that time, the universe will have continued to expand faster than the light is moving, so the light will never reach its destination.
If you'll accept a rounded-off answer:
8.642 x 1022 miles
or
86,417,000,000,000,000,000,000 miles
or
Nearly the distance light has been able to travel in a vacuum since the big bang.
There are approximently 63,239.6717 Astronomical Units (AU) in a Light-year (LY).
1 Astronomical Unit = 8.3167464 light-minutes
The Milky Way is roughly 100,000 light years in diameter. So, observers would conclude that it takes light 100,000 years to make the trip.
We live in the Milky Way Galaxy. It depends on which star. From the closest star, the sun, it takes about 8 minutes. But from other stars it can take many, many years.
Probably FOREVER!
The light from our Sun will take about 2.5 million years to reach the Andromeda Galaxy.
Light travels 186,300 miles per second
20 seconds
5 years in light years
Answer #1:A long time.......=====================Answer #2:Classically, it would take(the diameter of the universe, in miles)/(5,878,464,424,000) years.
20 hours
I don't know about the speed of lightning, but the fastest you can go is at the speed of light. You can't "cross the Universe" at this speed, because of the accelerate expansion of the Universe. Light that is emitted from any object that is a certain distance away from us - somewhere in the order of 10 billion light-years - will never be able to reach us.
About 100,000 years
If you were me 1800 light years
The light takes 8.19 mins (8 mins and 19 secs) to travel from our Sun to the Earth. Light from the stars can take years or billions of years depending on their position in the universe.
a long time
About 100,000 years. (the diameter of the Milky Way galaxy is 100,000 light years)
We all belong to the Universe, so we have already arrived . .
The Milky Way is about 100,000 light years in diameter; it would take light about 100,000 years to cover the whole distance.
That is approximately equivalent to 1 light-year. That is to say, if travelling at the speed of light - the highest possible speed in the Universe - it will take a year to get there.
Because of the serpentine motion - the long and winding road - that light and energy take as they go through the universe.