No object can move at the speed or faster than the speed of light.
If you could travel at the speed of light, you could go around the Earth 7.5 times in one second.
When we stare at even the nearest star, what we are seeing is light that left it more than 4 years ago. If you could stand on one 65 million light years away and look at Earth, you would able to see light that left Earth at the time the dinosaurs became extinct.
And from a distance of 4.7 billion light years you could watch the Earth and the Sun being formed.
Although the speed of light is often referred to as the universe’s speed limit, the universe actually expands even faster. According to astrophysicist Paul Sutter, the universe expands at roughly 68 kilometers per second per megaparsec, where a megaparsec is 3.26 million light-years.
The distance light travels in the course of a year is called a light-year. A light-year is a measure of both time and distance. It is not as hard to understand as it seems.
Light travels from the moon to our eyes in about 1 second. Sunlight takes about 8 minutes to reach our eyes.
Light from the nearest star system, Alpha Centauri requires roughly 4.3 years to get here, so that star system is said to be 4.3 light-years away.
In space, light travel at a speed of 186,282 miles per second (299,792 kilometers per second or 670,616,629 mph), and in theory nothing can travel faster than light.
If you are traveling at 90% of the speed of light, then you would experience only 10 minutes of time passing while a stationary person back on Earth would have experienced 20 minutes.
But in fact, If an object travels at the speed of light, its mass will increase exponentially. If the speed of light is 300,000 kilometers per second (186,000 miles per second) and when an object moves at this speed, its mass will become infinite. Therefore, infinite energy will be required to move the object, which is impractical.
That’s the reason why no object can move at the speed or faster than the speed of light.