The James Webb Space Telescope has discovered an exoplanet, 'ultrahot Jupiter' WASP-121b, or Tylos, leaking two vast helium tails. Located 858 light-years away, the planet orbits its star every 30 hours. Extreme radiation heats its atmosphere to about 2,300°C, causing lightweight gases like hydrogen and helium to escape the planet, flowing into space, creating these tails.