It will be able to test Einstein's general theory of relativity in strong field conditions and realize precision gravitational wave astronomy.

Nevertheless, the sensitivity needed to test Einstein's theory of gravity in strong field conditions or to realize a precision gravitational wave astronomy, mainly of massive stellar bodies or of highly asymmetric (in mass) binary stellar systems, goes beyond the expected performances of the advanced detectors and of their subsequent upgrades.

[1] Through its four technical working groups, the ET-FP7 project is addressing the basic questions in the realization of this proposed observatory: site location and characteristics (WP1), suspension design and technologies (WP2), detector topology and geometry (WP3), detection capabilities requirements and astrophysics potentialities (WP4).

In order to measure the polarization of incoming gravitational waves and avoid having an orientation to which the telescope is insensitive, a minimum of two detectors are required.

[3]: 15 A prototype, or testing facility, called the ETpathfinder was built at Maastricht University's Randwyck Campus in the Netherlands.

[4] The facility was opened in November 2021 by Dutch Minister of Education, Culture and Science, Ingrid van Engelshoven.

But it also has a network of knowledge partners to cooperate with, companies that can supply the high-tech, and pleasant, accessible living and working environments.

The Italian government is ready to support the candidacy of Sos Enattos (Sardinia) as a place for the construction of the telescope together with the Nobel prizewinner Giorgio Parisi.

[16] In September 2022, the Draghi government mandated the president of INFN Antonio Zoccoli to proceed with the creation of Italy's candidacy dossier,[17][18] confirming the 350 million euro of economic commitment already allocated by the Sardinia Region.