The Aldrin-Purdue Project, Mission to Mars

Back in October, I seized the opportunity, along with TFS member Marius Berge Eide, to attend the International Astronautical Congress. The 66th edition, hosted in Jerusalem, gathered more than 2000 people from the space world for a week of symposia and various events...

GPS and relativity

GPS is used every day on mobile phones, cars, trains, aircraft, … but if they just provide the device positioning on Earth why are they affected by relativity?