Europe's fifth and sixth Galileo satellites – subject to complex salvage manoeuvres following their launch last year into incorrect orbits – will help to perform an ambitious year-long test of Einstein's most famous theory.
Nov 09, 2015 in Space Exploration
It is no split-second decision. In fact, countries are at such odds over whether to do away with the "leap second"—an extra second periodically added to compensate for irregularities in the earth's rotation around the ...
Nov 19, 2015 in Space Exploration