Space-Time Explorer and Quantum Equivalence Principle Space Test (STE-QUEST) was a proposed satellite mission to test the Einstein

Equivalence Principle In the theory of general relativity, the equivalence principle is the equivalence of gravitational and inertial mass, and Albert Einstein's observation that the gravitational "force" as experienced locally while standing on a massive body (suc ...

to high precision and search for new fundamental constituents and interactions in the Universe. It was supposed to contain an

atom interferometer An atom interferometer is an interferometer which uses the wave character of atoms. Similar to optical interferometers, atom interferometers measure the difference in phase between atomic matter waves along different paths. Atom interferometers h ...

. It was selected in 2011 for an initial assessment phase as one of the five candidates of the

European Space Agency , owners = , headquarters = Paris, Île-de-France, France , coordinates = , spaceport = Guiana Space Centre , seal = File:ESA emblem seal.png , seal_size = 130px , image = Views in the Main Control Room (1205 ...

Cosmic Vision Cosmic Vision is the third campaign of space science and space exploration missions in the Science Programme of the European Space Agency (ESA). Formulated in 2005 as ''Cosmic Vision: Space Science for Europe 2015–2025'', the campaign succee ...

program.STE-QUEST ESA summary
/ref> On February 19, 2014, the

PLATO Plato ( ; grc-gre, Πλάτων ; 428/427 or 424/423 – 348/347 BC) was a Greek philosopher born in Athens during the Classical period in Ancient Greece. He founded the Platonist school of thought and the Academy, the first institution ...

mission was selected in favour of the other candidates in the programme, including STE-QUEST.

References

External links

Description on the Cosmic Vision website
European Space Agency space probes Cancelled spacecraft Cosmic Vision Projects disestablished in 2014 {{ESA-stub