What type of radiation is believed to be a remnant from the Big Bang?

The type of radiation believed to be a remnant from the Big Bang is cosmic microwave background radiation. This radiation is a form of electromagnetic radiation that fills the universe and is a crucial piece of evidence for the Big Bang theory. It originated when the universe cooled down enough for protons and electrons to combine and form hydrogen atoms, allowing photons to travel freely. As the universe expanded, this radiation was stretched to longer wavelengths, which is why we detect it today primarily in the microwave range.

Cosmic microwave background radiation is not only a remnant of the early stages of the universe but also provides valuable data about the conditions at that time. Its uniformity and slight variations help scientists understand the formation of galaxies and the evolution of the cosmos. This makes cosmic microwave background radiation distinct and significant in cosmology, as it serves as a snapshot of the universe when it was just about 380,000 years old.