Is ground-based astronomy a space activity?

An article published on the European Southern Observatory blog on September 10 describes an effort to protect the night sky – a crucial resource for astronomy – by recasting astronomy as the dominant form of human space exploration and thus attempting to have its activities ‘protected’ by the Outer Space Treaty (OST) and other similar … Read more

The clocks that used atoms and black holes to stay in sync

You’re familiar with clocks. There’s probably one if you look up just a little, at the upper corner of your laptop or smartphone screen, showing you what time of day it is, allowing you to quickly grasp the number of daytime or nighttime hours, depending on your needs. There some other clocks that are less … Read more