A Brief History of the Hubble Space Telescope

The World Above Our Heads
One of the Hubble's most prized portraits: the Hubble Deep Field, our most detailed view of the universe. The image is composed of 342 different exposures taken over 10 days, and features some 1,500 different galaxies. Other Hubble images have helped scientists better estimate the age of the universe and shed light on a mysterious antigravity force called "dark energy."

• Animals in Space