The characteristics of this telescope are :
Mass at launch : 11 000 kg
Orbit : low (~ 146,500 as of March 13, 2017)
Altitude : 590 km
Period* : 96-97 min
Tilt : 28.5 °
Diameter : 2.4 m
Focal length : 57.6 m
Wavelength : Visible, ultraviolet, near infrared

The utility of a space telescope is to capture and analyze the radiation that fails to penetrate through the atmosphere on the surface of the Earth.

The telescope is used to collect the light sent by the object, and to collect the background signal.