• The Giant Metrewave Radio Telescope (GMRT), located near Pune in India,World’s Largest Radio Telescope is an array of thirty fully steerable parabolic radio telescopes of 45 metre diameter, observing at metre wavelengths.
• It is operated by the National Centre for Radio Astrophysics, a part of the Tata Institute of Fundamental Research, Mumbai.
• At the time it was built, it was the world’s largest interferometric array offering a baseline of up to 25 kilometres.
• One of the aims for the telescope during its development was to search for the highly redshifted 21-cm line radiation from primordial neutral hydrogen clouds in order to determine the epoch of galaxy formation in the universe.
• Astronomers from all over the world regularly use this telescope to observe many different astronomical objects such as HII regions, galaxies, pulsars, supernovae, and Sun and solar winds.

Source: wiki