Nazarii_Neshcherenskyi/Shutterstock
Quasars are among the universe’s most extreme entities—luminous powerhouses that outshine their host galaxies. They form when vast amounts of gas, dust, and stellar debris spiral into a supermassive black hole, heating to millions of degrees and emitting more light than the galaxy that surrounds it. Quasars can be ten to one hundred thousand times brighter than the Milky Way, and their extreme gravity and friction make them ideal laboratories for studying the early cosmos.
Although the nearest quasars remain hundreds of millions of light‑years away, the light we receive from them has travelled billions of years, offering a direct glimpse into the universe’s formative epochs. One such quasar, APM 08279+5255, lies 12 billion light‑years from Earth and contains a black hole weighing 20 billion solar masses—a colossal gravitational engine that powers the most impressive water reservoir yet discovered.
Pike‑28/Shutterstock
In 2011, NASA’s Jet Propulsion Laboratory, led by Matt Bradford, partnered with astronomers who used the Plateau de Bure Interferometer in the French Alps. Their observations, published in The Astrophysical Journal Letters, uncovered a cloud of water vapor encompassing a region hundreds of light‑years across and containing 140 trillion times the total amount of water on Earth. This discovery marked the first time a quasar’s interstellar medium had been found to host such a vast amount of water.
A second team confirmed the finding with the Z‑Spec spectrometer and additional radio dishes, ensuring the robustness of the measurement and the accuracy of the inferred scale of the quasar’s water vapor.
The water exists in a hostile environment: temperatures near –81.4 °F (–61 °C) and densities a hundredfold greater than typical interstellar clouds. Unlike the icy or liquid water found on moons such as Europa or Enceladus, this vapor is pure, dense, and wholly ionized by the quasar’s intense radiation field.
Because the light from APM 08279+5255 has traveled 12 billion years, we observe this reservoir as it existed shortly after the Big Bang. The presence of water so early indicates that the fundamental ingredients for life were forged and dispersed throughout the cosmos from the universe’s infancy.
A 2025 study in Nature Astronomy suggests that water existed during the formation of the first galaxies, reinforcing the idea that water is a fundamental component of cosmic evolution.
Beyond its implications for astrobiology, the discovery sheds light on star and galaxy formation. Water vapor cools gas clouds, facilitating their collapse into new stars—a process that appears to have been active even in this distant, dense quasar environment.
Thus, the APM 08279+5255 quasar challenges the perception of early cosmic space as barren, revealing instead a dynamic, warm, and water‑rich region that informs our understanding of the universe’s development.
