New Releases by Carl Sagan

Beschouwingen van een bekend Amerikaans astronoom over wetenschapsbeoefening, pseudo-wetenschap, UFO''s, science fiction, de samenleving, evolutie, buitenaards leven en godsdiensten.

Dr. Carl Sagan Takes Us on a Great Reading Adventure, Offering his Vivid and Startling Insight Into the Brain of Man and Beast, the Origin of Human Intelligence, the Function of our Most Haunting Legends -- and Their Amazing Links to Recent Discoveries. Book jacket.

"A translation, extension, and revision of [the author''s Vselennai︠a︡, zhiznʹ, razum]". Bibliography: p. 489-495.

Contrary to the conclusions previously drawn, the polar-cap recession data suggest the dark areas are highlands, because of the greater wind velocities and frost-vaporization rates anticipated for highlands. From the quasi-specular component of the radar power reflectivity and from the radar Doppler spectra, both functions of Martian longitude, the Martian dark areas are found to tend to have systematically higher elevations than the adjacent bright areas. Mean slopes of a few degrees or less are deduced, and elevation differences up to 17 km are inferred.