Europe launches satnav orbiters

Europe sent two satellites into space Friday as it pushes to get its beleaguered Galileo satnav programme back on track.

67P/Churyumov–Gerasimenko, then and now

What a difference a year can make. Rosetta arrived at Comet 67P/Churyumov–Gerasimenko on 6 August 2014, achieving rendezvous at a distance of 100 km before moving even closer to the nucleus in the following weeks. The image ...

Sharper GPS needs even more accurate atomic clocks

The GPS network might just be Earth's greatest piece of infrastructure. It's effectively a collection of clocks in space that serve up time information 24/7 free of charge to anyone on the planet who cares to listen.

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