## How do you calculate time it takes light to travel?

Calculations involving light years and distance – Higher

- A light year is a distance.
- It is the distance light travels in one year.
- As light travels at constant speed, the distance light travels in a year can be calculated using the equation:
- Distance = speed x time.
- time = 1 year = 365 x 24 x 60 x 60 = 31,536,000 s.

**How fast is time dilation at the speed of light?**

At speeds of less than 10% of the speed of light (0.1c or 30,000 km/sec) time dilation is miniscule, but from 99% speed of light up it increases asymptotically towards infinite.

**What is the time dilation at 99 speed of light?**

That depends on how fast you’re traveling. Thanks to Einstein, we know that the faster you go, the slower time passes–so a very fast spaceship is a time machine to the future. Five years on a ship traveling at 99 percent the speed of light (2.5 years out and 2.5 years back) corresponds to roughly 36 years on Earth.

### How much does time slow at the speed of light?

Thus, the calculations show that at 25% of the speed of light, the effect is just 1.03 (a mere 3% slowing of time or contraction of length); at 50% of the speed of light, it is just 1.15; at 99% of the speed of light, time is slowed by a factor of about 7; and at 99.999, the factor is 224.

**How long does it take to travel 1.3 light seconds?**

Light travels at 300,000 kilometres per second, so it takes about 1.3 seconds for light to travel from the Moon back to the Earth. In other words, the Moon is 1.3 light-seconds away from the Earth.

**What is 90% the speed of light?**

Beyond our solar system, the next closest star system is Proxima Centauri, and it would take more than two years to get there at 90% of the speed of light. This time differentiation is called time dilation. This is a fact of space travel that forms part of Albert Einstein’s theory of relativity.

#### Do you age slower at the speed of light?

According to the theory of relativity, the faster something travels, the slower time moves for it. So, if an astronaut leaves earth and travels close to the speed of light, he will feel like 2 years have passed on his journey, but when he returns to earth, 40 years will have passed (or whatever).

**Do you actually age slower in space?**

Scientists have recently observed for the first time that, on an epigenetic level, astronauts age more slowly during long-term simulated space travel than they would have if their feet had been planted on Planet Earth.

**What would happen if I traveled at the speed of light?**

Answer: Firstly, the physical consequence of traveling at the speed of light is that your mass becomes infinite and you slow down. According to relativity, the faster you move, the more mass you have. The same works on Earth when you’re driving down the freeway.