## Nothing can go faster than light in a vacuum (about 300,000 kilometers per second). here because.

For a long time, scientists believed that light has an infinite speed. On the other hand, in our daily life, every time we turn on the lamp, the light is on immediately. In the seventeenth century, a Danish astronomer appeared like that **Olly Romer**It assumes that light has a certain speed. It was he who determined its value, while working at the Paris Observatory, which he headed at that time **John Dominic Cassini**. He got there by observation *I*one of the most famous moons of Jupiter.

### the details

In practice, the satellite completes a full orbit around Jupiter in 1.76 days. Romer noted, however, that it was taking time **She wasn’t always the same** and that, at certain times of the year, *I* It took longer to make a full circle around the gas giant. When Earth was farther from Jupiter, it took longer. Conversely, when the two planets were closer, the moon appeared **Anticipate his revolution**. So Romer came to the conclusion that the speed of light is not infinite. With this assumption, it may take some time for light to reach Earth from Jupiter.

### The speed of light

Romer’s hypothesis did not fully convince other scientists of the time. To prove his point, the astronomer predicted that the eclipse *I*scheduled for **November 9, 1676**would have happened **10 minutes ago** compared to the time calculated by all other scientists based on previous transits of the Moon around Jupiter. This prediction came true, and even Cassini has to convince itself that the speed of light is not infinite. Roemer explained that the light took 22 minutes to cross the diameter of the Earth’s orbit and calculated it at a speed of 220,000 kilometers per second, which is of course an incorrect measurement (the exact speed is 299,792.458 km / s), but it is certainly closer to its true value. .

#### Because nothing can transcend light

Some scientists argue that there are some particles called “tachyones”, which have the property of traveling **at speeds greater than the speed of light**. The problem is that even if it exists, it can never slow down. More than a century ago, Einstein demonstrated that energy *And* of an object related to its mass *M*: Hence the famous formula of relativity that predicts this *e = mk ^{2}*where

*c*It is exactly the speed of light.

This equation tells us that energy and mass are equivalent entities and that they can transform into each other. If you think about it, this is exactly what happens **When we accelerate the body**: the energy we give off goes in part to increasing its mass. This means that more and more energy is needed to increase the speed of objects. The closer you are to the light, the more massive amount of energy you need. A man weighing 80 kg, for example, would have a mass of 2 tons if he traveled at 99.9% speed. *c*. If we tried to push it beyond this speed, it would increase its mass beyond imagination, leaving the speed practically unchanged. That’s why you can’t go faster than the speed of light (let alone reach it with our technology).

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