After 20 years in space, NASA's Cassini spacecraft has begun the final chapter of its exploration of Saturn. It will end with a spectacular crash into its surface. Professor Alan Duffy will be there as the action unfolds.
After 20 years in space, NASA's Cassini spacecraft has begun the final chapter of its exploration of Saturn. It will end with a spectacular crash into its surface. Professor Alan Duffy will be there as the action unfolds.