Bakgrundsutstrålning

Bakgrundsutstrålning, also known as cosmic microwave background radiation, is a form of electromagnetic radiation that fills the entire universe. It is a remnant from the Big Bang, the event that marked the beginning of the universe approximately 13.8 billion years ago. This radiation is uniform in all directions and has a temperature of about 2.7 Kelvin (-270.45 degrees Celsius), making it one of the coldest known places in the universe.

The discovery of cosmic microwave background radiation in 1964 by Arno Penzias and Robert Wilson was a significant milestone in cosmology. It provided strong evidence for the Big Bang theory and the expansion of the universe. The radiation is detected as a faint glow in the microwave region of the electromagnetic spectrum.

Bakgrundsutstrålning is not visible to the naked eye and is typically measured using specialized instruments, such as radio telescopes. Its discovery and subsequent study have been instrumental in advancing our understanding of the universe's origin, evolution, and structure. The slight variations in the temperature of the cosmic microwave background radiation, known as anisotropies, provide valuable information about the early universe and the formation of large-scale structures, such as galaxies and galaxy clusters.