Clump of active galactic cores that stretch 4 billion light-years from end to end. The structure is a light quasar group (LQG), a collection of extremely luminous Galactic Nulcei powered by supermassive central black holes.
Neptune is the and last planet of the solar system, as Pluto was categorized as a dwarf-planet a few years ago. Dark, cold and whipped by supersonic winds, Neptune is the furthest away from the Sun of the hydrogen and helium gas giants in our Solar Sy
A primitive ocean on Mars held more water than Earth’s Arctic Ocean, and covered a greater portion of the planet’s surface than the Atlantic Ocean does on Earth, according to new results published today.
Pluto, as imaged by the New Horizons spacecraft. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute