Joris Witstok

In a distant galaxy, almost all light comes not from stars, but from clouds of hot gas. This discovery helps understand what the Universe looked like shortly after the Big Bang. Perhaps the gas is heated by remnants of the first stars, which consisted only of hydrogen and helium. This explains why t

Near the galaxy GN-z11, seen just 400 million years after the Big Bang, the James Webb Space Telescope spotted a bright spot. It glows with hot helium — such radiation can only come from very massive stars devoid of heavy elements, that is, the first generation. If confirmed, we are seeing for the f