The “James Webb Space Telescope” (JWST) aims to succeed the "Hubble Space Telescope" (HST), which should stop its observations in 2019. It will have a segmented mirror 6.5 meters in diameter, increasing the power of separation. It will be installed at the L2 Lagrange point of the Sun-Earth system.
Unlike the HST that had access to the visible and ultraviolet spectrum, the JWST will observe in the near infrared. It will search for the faint lights of the first stars that appeared shortly after the "big bang" and observe the systems of exo planets which possibly shelter life.