HENNING DALHOFF / SCIENCE PHOTO LIBRARY HENNING DALHOFF / SCIENCE PHOTO LIBRARY
Early history of the universe. Artwork showing the cooling and expansion of the early universe from its origin in the Big Bang (upper left). The first stage (orange area) is a mixture of protons (blue balls), neutrons (yellow balls) and light photons (yellow arrows). The following four stages (seen from left to right as curved bands) are: a line of hydrogen and helium atoms (379,000 years); the universe becoming transparent to radiation (the straight lines of light); the formation of the first stars (400 million years) and gas clouds (blue area); and the formation of the galaxies (final band, with galaxies shown).
Model release not required. Property release not required.