(Extended Roentgen Survey with an Imaging Telescope Array)
(Russian/German space X-ray telescope launched in 2019)
(for Extended Roentgen Survey with an Imaging Telescope Array)
is a space X-ray Wolter telescope which is one of the instruments
on the Russian Spektr-RG (SRG) space observatory.
Its primary function is repeated all-sky surveys,
covering up to 10 keV, aiming to observe the effects of dark energy.
(survey,space,telescope,instrument,X-ray,imager,dark energy,all sky,German)
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