Electromagnetic radiation is a type of energy that is emitted and absorbed by charged particles. It includes a wide range of wavelengths and frequencies, from radio waves to gamma rays.
To calculate the electromagnetic radiation from a star, scientists use the inverse square law, which states that the intensity of radiation decreases as the distance from the source increases. They also take into account the star's luminosity, or the amount of energy it emits per second.
The distance of 13 million light-years is significant because it represents an immense distance in space. It means that the star's light that we are seeing now has been traveling for 13 million years to reach us, giving us a glimpse into the past.
The distance of a star directly affects its electromagnetic radiation. As the distance increases, the intensity of radiation decreases, so a star that is 13 million light-years away would appear much dimmer than a star that is closer to us.
Calculating electromagnetic radiation from stars allows us to understand the properties and behavior of stars, as well as their impact on the surrounding environment. It also helps us to better understand the history and evolution of our universe.