More than 30 years have passed since the Voyager 2 fly-bys of Uranus and Neptune. I discuss a range of lessons learned from Voyager, broadly grouped into process, planning, and people.

Asteroids approaching: One as big as Mount Everest, one closer than the moon The two astronomical fly-bys will occur just in time for Asteroid Day.

A small asteroid was visible in northern Siberia on Tuesday, as it closed in on its collision course with Earth. It's the first of two expected asteroid fly-bys this week.