Astronomy Colloquium

The Grism Lens-Amplified Survey from Space (GLASS) is a large HST cycle-21 program targeting 10 massive galaxy clusters with extensive HST imaging from CLASH and the Frontier Field Initiative. The program consists of 140 primary and 140 parallel orbits of near-infrared WCF3 and optical ACS grism observations, which result in spatially resolved spectroscopy of thousands of galaxies.  I will present some of the first highlights from GLASS: 1) a census of lya emission at z>6, and resulting constraints on the epoch of reionization; 2) spatially resolved star formation and metallicity gradients at 1.3<z<2.3 as probes of the physics of gas accretion, star formation, and outflows. 3) The discovery of the first multiply-imaged supernova and the consequent first blind prediction of the appearance of a supernova in the sky.