The speed of light, although a huge number, is finite. The limited speed of light makes it almost impossible to capture a moment in time of a certain part of the world with a single camera. For example, the words you read are now 0.5 meters away from you, because the speed of light is 300,000 kilometers per second, and the light emitted by these words (more precisely, the white light emitted by the white background around them) was emitted about 1.7 nanoseconds ago. You and your Britney look at the moon during the Mid-Autumn Festival, and the moon you see at that time is the image of a second ago. For example, because the Sun is 150 million kilometers away, the Sun you see is the Sun 8 minutes and 19 seconds ago.
If the speed of light is only half. You are a person who has heard of Einstein's mass-energy equivalence relationship, and you know that famous formula that energy is equal to mass multiplied by the square of the speed of light. You immediately jump up and tell me that it's over, the energy of solar radiation is only a quarter of the original, and the earth will immediately enter an endless winter that is cooler than Mars, which means that the temperature of the earth will drop to at least minus 60 degrees.
If the speed of light is only half. If you have studied a little bit of optics, you will also jump up and say, it's over, we can't see all the colorful scenes, because the wavelength of light will be shortened by half, and the human eye can see the longest wavelength of red running to the ultraviolet side, and the human eye can see the shortest wavelength of purple running to the shortest ultraviolet side. Will we become blind?
If the speed of light is only half. If you studied a little bit of astronomy, you would say that the faintest stars we see will not be visible because they become much darker, specifically a half and a half degrees darker. Astronomers who use state-of-the-art telescopes to see galaxies that are very far away may not be as far away, and the number will drop to only one-eighth of what it used to be.
The list goes on and on. If the speed of light really is half as fast as it used to be, will these changes really happen? It's not a simple question. To answer this question, let's assume that you are a photon and see what changes you will see.
Well, now let's assume that you are a photon, which is one of the countless particles that make up the beam. If you were a photon, your experience of the world would be unprecedented. First of all, you are the fastest running object, whether compared to any animal in the organic world, or to any man-made vehicle in the inorganic world, or to anything in nature. The fastest train is traveling at about 360 kilometers per hour and takes about 4 days and 15 hours to circle the globe. What if you're the fastest civil aircraft? With supersonic airliners already a thing of the past, it would take you 40 hours to circle the globe. If you were a photon, you would have circled the Earth seven and a half times in one second!
Nothing can speed you higher, which was discovered by Albert Einstein more than a century ago and has been continuously confirmed by physicists. In September 2011, a group of physicists, mainly Italians, discovered that neutrinos exceed the speed of light, only more than 1/10,000 times the speed of light, which attracted widespread attention from the world and scientists. Less than half a year later, they were ashamed to find that the optical fiber that connected the GPS receiver to the computer had been loosened, resulting in a slight reduction in the time it took to fly neutrinos from CERN to Gran Sasso Cave, which was only 60 nanoseconds. Returning these 60 nanoseconds, the neutrino takes the same time to complete the distance as light. So, so far, photons are still invincible in velocity.