How long would it take to go one light year at the speed of light?
It would need about 17,565 years at this speed to travel a complete light year. Este exemplo é da Wikipedia e pode ser reutilizado sob a licença CC BY-SA.
How long would it take to travel 1 Lightyear at the speed of light?
Travelling a lightyear
It would still take around 27 thousand years to travel one lightyear. A plane travelling at 965 km/h (600 mp/h) would take 1 million years to travel one lightyear.
(1) Start at the Earth in a rocket and accelerate constantly 1-g for the entire trip. You would reach the end-point [4 light-years away] in 2.25 years of rocket time, or 4.87 years as seen from the Earth. The rocket speed at that instant would be .
How Many Years are in a Light Year? | The Speed of Light
Will we ever travel light-years?
Based on our current understanding of physics and the limits of the natural world, the answer, sadly, is no. According to Albert Einstein's theory of special relativity, summarized by the famous equation E=mc2, the speed of light (c) is something like a cosmic speed limit that cannot be surpassed.
For example, the light-second, useful in astronomy, telecommunications and relativistic physics, is exactly 299792458 metres or 1⁄31557600 of a light-year. Units such as the light-minute, light-hour and light-day are sometimes used in popular science publications.
So, a light year cannot be measured in mph. Here's what we know: Light travels at a constant speed of 670,616,629 mph which means that light covers a speed of 670 million miles in an hour. Light travels a distance of 5.88 trillion miles in one Earth year, according to NASA.
How much time would pass on Earth if I traveled at the speed of light for a year?
At 99.99 percent of the speed of light, a craft traveling for one year would come back to a world that had aged more than 70 years in their absence. At 99.99999 percent of the speed of light, for a year, more than 2000 years would pass on Earth.
What would happen if you traveled at the speed of light?
If an object ever did reach the speed of light, its mass would become infinite. And as a result, the energy required to move the object would also become infinite: an impossibility.
The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space in one second, and is equal to exactly 299792458 m (approximately 983571055 ft or 186282 mi).
Will we ever be able to travel at the speed of light?
Nothing can travel faster than 300,000 kilometers per second (186,000 miles per second). Only massless particles, including photons, which make up light, can travel at that speed. It's impossible to accelerate any material object up to the speed of light because it would take an infinite amount of energy to do so.
Starting from launch on January 19, 2006, and with a gravity assist from Jupiter along the way, NASA's New Horizons spacecraft took 9 years and 5 months to get to Pluto, 39 AU from the Sun. It traveled at an average speed of 4.1 AU/year. Deep-space missions can take up to 10 years from development to launch.
In the context of talking about speeds, darkness is what you get after the light stops coming, and therefore travels at the speed of light. For instance, consider that you are in distant space, far from all light sources such as the sun, and you have a light bulb on the nose of your space ship.
At the current level of technology, it is not possible for a human to travel one light-year, as the distance is incredibly vast, approximately 5.88 trillion miles (9.46 trillion kilometers). Even with the fastest spacecraft that has ever been built, it would take tens of thousands of years to travel one light-year.
A light year is a unit of distance, equivalent to the distance that light travels in one year, in a vacuum. Hence, if a star is four light years away, it means light takes four years to get from that star to us. Now, light travels very, very fast, about 300,000 km per second.
Since light has a speed of 186,000 miles per second (light can travel about 7 times around the entire earth in 1 second!), light travels about 5,865,696,000,000 miles in just one year. You can attach 9 more zeros to the end of this to get 1 billion light-years and another one for 10 billion light-years.
Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year. NASA/JPL-Caltech. We use light-time to measure the vast distances of space. It's the distance that light travels in a specific period of time.
A light-year is a measurement of distance and not time (as the name might imply). A light-year is the distance a beam of light travels in a single Earth year, which equates to approximately 6 trillion miles (9.7 trillion kilometers).
In the laws of physics of the universe, as long as there are objects with mass, they cannot reach the speed of light. Even if it is a tiny particle, scientists can only accelerate it to 99.999% of the speed of light.
The most obvious answer appears to be light. In a vacuum, light travels approximately 186,000 miles per second (300,000 kilometers per second). Nothing in the universe that we know of can exceed this speed.
Light just keeps going and going until it bumps into something. Then it can either be reflected or absorbed. Astronomers have detected some light that has been traveling for more that 12 billion years, close to the age of the universe. Light has some interesting properties.
