LEONARD DAVID: A Real Mess in Orbit: Space Junk to Hang Around Longer Than Expected. “Space junk continues to clutter the friendly cosmic skies, posing threats to satellites and spacecraft, with scientists working to identify which bits of orbital rubbish to pluck from the heavens first. But a new study suggests they’re fighting an uphill battle. New research on changes in the Earth’s upper atmosphere suggests space debris could remain in orbit for longer than expected.”