External occulters for direct observation of exoplanets: an overview
External tropospheric calibration for VLBI observations
Extra large telescope actuator
Extra-solar planet searches with a Penn State optical/IR dispersive interferometer at the Hobby-Eberly Telescope
Extraction of Atmospheric Water on Mars for the Mars Reference Mission
Extraction of the Photometric Information: Corrections
Extraterrestrial Amino Acids in the Almahata Sitta Meteorite
Extreme-ultraviolet filters for 58.4 and 83.4 NM
Extremely Large Ground-based Telescopes (ELTs): Performance Comparisons with 8-m class Space Telescopes
Extremely large telescope: further adventures in feasibility
Extrinsic germanium blocked-impurity-band detector arrays