Gravity and seismic reflection data, together with geologic mapping, indicate that the Mt. Toondina feature in South Australia is best interpreted as an eroded 4-km-diameter impact structure consisting of a ring structural ...

Scintillations (high frequency variations) observed in the radio signal during the occultation of Voyage 1 by Titan (Hinsonand Tyler 1983) provide information concerning neutral atmospheric density fluctuations on scales ...

This paper examines optimal low-thrust gravity-assist trajectories to Jupiter using nuclear electric propulsion.

Coronae are approximately circular features unique to Venus.

Owing to the size and extent of the Great Lakes and the variety of ice types features found there, the timely and objective qualities inherent in computer processing of satellite data make it well suited for monitoring and ...