CAPE CANAVERAL, Fla. — Final steps are underway here to prepare the next sun-observing spacecraft, a $1.5 billion joint project between NASA and the European Space Agency (ESA), for launch. Dubbed ...

There’s a bit of a paradox about our galaxy: it’s both jam-packed with stars and cavernously empty. The Milky Way is crowded in the sense that it holds hundreds of billions of stars, as well as ...

With so many interesting solar system facts, we've narrowed them down to 25 of our favorites. Our solar system consists of the sun and everything that orbits that sun, like the eight (once nine) ...