Telescope
Most big telescopes for astronomy are made to study very carefully things that are already known.  A few are made for searching, such as for unknown asteroids or extrasolar planets.  Most big telescopes are made to be used with a CCD (Charge-Coupled Devices) camera instead of just the eye.  This is called "Astrophotography".  A Go-to telescope is needed to track Deep Sky objects and is placed on an Equatorial Mount for the axis to point towards Polaris, this is called polar alignment.