I understand the electromagnetic spectrum travels below speed c in Earth’s atmosphere. Is there any part of the spectrum which remains at speed c, or indeed anything which travels at speed c in the atmosphere?
The speed of light in a vacuum is approximately 299,792,458 meters per second, or c, which is the fastest speed at which anything can travel. However, the speed of light can be slowed down in different mediums such as air, water, or glass.
No, nothing can travel at the exact speed of light in the atmosphere. As mentioned before, the speed of light can be slowed down in different mediums, but it can never be reached or exceeded.
According to Einstein's theory of relativity, as an object approaches the speed of light, its mass increases and it requires an infinite amount of energy to accelerate it further. This is why it is impossible for anything to travel at the speed of light in the atmosphere.
Scientists have discovered particles called neutrinos that can travel very close to the speed of light in a vacuum. However, they still have a tiny amount of mass and therefore cannot truly reach the speed of light in the atmosphere.
The constant speed of light plays a crucial role in many scientific theories, including general relativity and the Big Bang theory. It also helps us understand the vast distances in our universe and how time and space are interconnected.