A large cloud of gas that has spawned dense internal knots which gravitationally collapsed to form stars is seen in this NASA handout image from the Hubble Space Telescope released December 13, 2012. Many young stars are visible in this image, along with what is left of the initial gas cloud. Some stars were so massive they have already evolved and exploded in a supernova. REUTERS/NASA/Handout

Test your knowledge of space and our history exploring it.