But fresh research suggests that we should keep an eye on planets that look purple, instead of green, in our search for extra-terrestrial life. "Purple bacteria can thrive under a wide range of ...

Written by the former chief historian of NASA, the book examines the evolution of our cosmic understanding—from early civilizations to the present day ...

The views span the universe from nebulae to galaxies ... of young stars that appear in bright purple with white dots at their centers. Gas giant planet Jupiter shines in a view that combines ...