Abstract
This paper considers requirements for a future large space telescope to follow the James Webb Space Telescope, starting in the next decade. Its ambitious science program includes direct imaging and spectroscopy of Earth-like planets orbiting other stars, resolving individual stars in nearby galaxies, and probing the most distant regions of the observable universe to a visible-light resolution of 100 parsec, while providing high spectral resolution for wavelengths from 100 to 2,500 nm. The top-level optical requirements flowdown is briefly described, with reference to existing and future capabilities. The intent is to identify technology development needed in the last half of this decade, to support the priorities of the 2020 Decadal Survey.
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