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ESA's LISA Pathfinder took off on December 3 aboard a Vega rocket from Europe's Kourou spaceport, French Guiana, en route to demonstrate the technology for observing gravitational waves from the space.
Gravitational waves are ripples in the structure of space-time, predicted a century ago by Albert Einstein's General Theory of Relativity, published on December 2, 1915.
LISA Pathfinder will test the extraordinary technology needed to observe gravitational waves from space. At its heart is a pair of identical 46mm gold-platinum cubes separated by 38cm, which will be isolated from all external and internal forces acting on them except one: gravity.
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