“The Incredible Speed of Light: Exploring the Fastest Known Entity in the Universe”

WASHINGTON – Light faster than anything else in the known universe, though its speed can change depending on the medium through which it travels. Nothing can travel faster than light, including the finest spacecraft humans have built.

So how many speed of light ? Light travels at the incredible speed of 300,000 kilometers per second (186,000 miles per second). That speed is equivalent to nearly 700 million miles per hour (more than 1 billion km per hour). That speed can circle the world 7.5 times in one second.

In comparison, a regular commercial jetliner takes more than two days to make one trip around the world. It does not include stopping for fuel or layovers.

Light moves so fast that it is thought to be moving constantly. As discovered by scientist Ole Roemer in the early 1600s, who measured the speed of light (commonly called c) using observations of Jupiter’s moons.

Around the turn of the 19th century, physicist James Clerk Maxwell created his theory of electromagnetism. Light consists of electric and magnetic fields, so electromagnetism can theoretically describe the behavior and motion of light, including its speed.

Finally obtained a value for the speed of light is 299,788 kilometers per second, with a margin of error of plus or minus 30. In the 1970s, physicists used lasers to measure the speed of light with much higher precision, leaving only an error of 0.001.

“All have agreed that the speed of light is 299,792.458 kilometers per second, to be precise. Currently, the speed of light is used to determine the unit of length, so the value is fixed,” wrote the Live Science page, Wednesday (31/5/2023).