NASA’sNew Horizons spacecraft has delivered extraordinary video footage showing towering ice mountains on Pluto’s moon Nix. These ice peaks, some rising as high as 11,000 feet, are made of pure water ...

Senior editor Craig Covault interviewed Alan Stern, overall lead manager and principal investigator for the Pluto-bound New Horizons spacecraft, for a cover story, in the issue dated January 9, 2006.

NASA chief Jared Isaacman’s call to restore Pluto’s planetary status has reignited a long-running scientific debate over whether the icy world was unfairly demoted from the solar system’s official ...