Cosmic background radiation is a form of electromagnetic radiation that is present throughout the entire universe. It is a remnant of the Big Bang and is thought to be the oldest light in the universe.
Cosmic background radiation was first discovered in 1964 by physicists Arno Penzias and Robert Wilson, who were studying microwave radiation. They found a constant, low-level background noise that could not be explained by any other known source, leading to the discovery of cosmic background radiation.
Cosmic background radiation is important because it provides evidence for the Big Bang theory, which states that the universe began with a huge explosion. It is also used to study the early universe and the formation of galaxies, as it carries information about the conditions of the universe in its early stages.
Cosmic background radiation is measured using specialized instruments, such as radio telescopes, that can detect and measure microwave radiation. Scientists also use satellites, such as NASA's COBE and WMAP, to map and study the cosmic background radiation in different wavelengths.
No, cosmic background radiation is not harmful to humans. The level of radiation is very low and is spread evenly throughout the universe, so it poses no threat to human health. In fact, we are constantly exposed to low levels of cosmic background radiation from space and natural sources on Earth.