Space Discovery Guides

Black holes are one of the greatest mysteries of outer space. No visible light can escape the strong gravity of a black hole. This makes black holes invisible—and very difficult to study. But scientists make new discoveries and develop new theories...

Did you know that companies and governments send more than one hundred satellites into space every year? And that most of those satellites continue to orbit Earth—even after they have stopped working? More than 500,000 old satellites, pieces of metal,...

Have you ever dreamed of walking on Mars? Or maybe even living there? Ever since Mars was discovered, people have wondered if there could be life on this mysterious red planet. For years, astronomers at NASA and other space agencies have been...

Did you know that Pluto has mountains, glaciers, and even blue skies? In July 2015 a spacecraft called New Horizons finally reached Pluto—almost ten years after it had launched! The spacecraft flew by Pluto to take the first close-up photos of the...

Have you ever wondered what it would be like to go into outer space? Soon you might be able to find out! For years, only trained astronauts were allowed to travel through space, but now lots of companies are creating spacecraft that will allow regular...