(past proposal for space mission to detect gravitational waves)
The New Gravitational Wave Observatory (NGO or eLISA) was
a proposed European Space Agency space gravitational-wave detector to sense gravitational waves
by measuring the distance between three spacecraft
using laserinterferometry.
It was a 2011 scaled-down variation on the earlier LISA proposal.
NGO was ultimately not selected by the ESA.
Since then, further proposals for a future (2030s)
three-spacecraft GW detector again use the name LISA.